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As filed with the Securities and Exchange Commission on April 27, 2022

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F

REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2021

OR

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________________ to ______________________________

Commission File Number          001-38215

NUCANA PLC

(Exact name of Registrant as specified in its charter)

England and Wales

(Jurisdiction of incorporation or organization)

NuCana plc

3 Lochside Way

Edinburgh EH12 9DT

United Kingdom

Telephone: +44 (0)131 357 1111

(Address of principal executive offices)

Hugh S. Griffith, Chief Executive Officer

NuCana plc

3 Lochside Way

Edinburgh EH12 9DT

United Kingdom

Telephone: +44 (0)131 357 1111

Email: info@nucana.com

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:

 

Title of each class

 

Trading Symbol(s)

 

Name of each exchange on which registered

American Depositary Shares, each representing one Ordinary Share, nominal value £0.04 per share

 

NCNA

 

The Nasdaq Stock Market LLC

 

Securities registered or to be registered pursuant to Section 12(g) of the Act: None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report: 52,179,979 ordinary shares, par value £0.04 per share.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes      No  

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Yes      No  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes      No  

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes      No  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

 

Large accelerated filer

 

Accelerated filer

 

Non-accelerated filer

 

 

 

 

Emerging growth company

 

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.  

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

 

U.S. GAAP  

 

International Financial Reporting Standards as issued

by the International Accounting Standards Board  

 

Other  

 

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow. Item 17      Item 18  

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes      No  

 

Auditor Firm Id: 1438         Auditor Name: Ernst & Young LLP      Auditor Location: Edinburgh, Scotland

 

 

 

 

 

 

A


TABLE OF CONTENTS

 

 

 

 

Page

 

 

 

 

GENERAL INFORMATION

iv

PRESENTATION OF FINANCIAL AND OTHER DATA

iv

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

iv

WEBSITE DISCLOSURE

v

PART I

 

 

1

Item 1.

 

Identity of Directors, Senior Management and Advisers

1

Item 2.

 

Offer Statistics and Expected Timetable

1

Item 3.

 

Key Information

1

 

A.

 

Selected Financial Data

1

 

B.

 

Capitalization and Indebtedness

2

 

C.

 

Reasons for the Offer and Use of Proceeds

2

 

D.

 

Risk Factors

2

Item 4.

 

Information on the Company

54

 

A.

 

History and Development of the Company

54

 

B.

 

Business

54

 

C.

 

Organizational Structure

94

 

D.

 

Property, Plant and Equipment

94

Item 4A.

 

Unresolved Staff Comments

94

Item 5.

 

Operating and Financial Review and Prospects

95

 

A.

 

Operating Results

95

 

B.

 

Liquidity and Capital Resources

100

 

C.

 

[Reserved]

102

 

D.

 

[Reserved]

102

 

E.

 

Critical Accounting Estimates

102

 

F.

 

[Reserved]

105

 

G.

 

[Reserved]

105

 

H

 

Non-GAAP Financial Measures

105

Item 6.

 

Directors, Senior Management and Employees

106

 

A.

 

Directors and Senior Management

106

 

B.

 

Compensation

109

 

C.

 

Board Practices

117

 

D.

 

Employees

120

 

E.

 

Share Ownership

120

Item 7.

 

Major Shareholders and Related Party Transactions

120

 

A.

 

Major Shareholders

120

 

B.

 

Related Party Transactions

123

 

C.

 

Interests of Experts and Counsel

123

Item 8.

 

Financial Information

124

 

A.

 

Consolidated Statements and Other Financial Information

124

 

B.

 

Significant Changes

124

Item 9.

 

The Offer and Listing

124

 

A.

 

Offer and Listing Details

124

 

B.

 

Plan of Distribution

124

 

C.

 

Markets

124

 

D.

 

Selling Shareholders

124

 

E.

 

Dilution

124

 

F.

 

Expenses of the Issue

124

 

 

ii

 


TABLE OF CONTENTS

(continued)

 

Item 10.

 

Additional Information

124

 

A.

 

Share Capital

124

 

B.

 

Memorandum and Articles of Association

124

 

C.

 

Material Contracts

141

 

D.

 

Exchange Controls

141

 

E.

 

Taxation

141

 

F.

 

Dividends and Paying Agents

149

 

G.

 

Statement by Experts

150

 

H.

 

Documents on Display

150

 

I.

 

Subsidiary Information

150

Item 11.

 

Quantitative and Qualitative Disclosures About Market Risk

150

Item 12.

 

Description of Securities Other than Equity Securities

151

 

A.

 

Debt Securities

151

 

B.

 

Warrants and Rights

151

 

C.

 

Other Securities

151

 

D.

 

American Depositary Shares

151

PART II

 

 

153

Item 13.

 

Defaults, Dividend Arrearages and Delinquencies

153

Item 14.

 

Material Modifications to the Rights of Security Holders and Use of Proceeds

153

Item 15.

 

Controls and Procedures

153

 

A.

 

Disclosure Controls and Procedures

153

 

B.

 

Management’s Annual Report on Internal Control over Financial Reporting

153

 

C.

 

Attestation Report of the Registered Public Accounting Firm

153

 

D.

 

Changes in Internal Control Over Financial Reporting

153

Item 16A.

 

Audit Committee Financial Expert

153

Item 16B.

 

Code of Ethics

154

Item 16C.

 

Principal Accountant Fees and Services

154

Item 16D.

 

Exemptions From the Listing Standards For Audit Committees

154

Item 16E.

 

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

154

Item 16F.

 

Change in the Registrant’s Certifying Accountant

154

Item 16G.

 

Corporate Governance

154

Item 16H.

 

Mine Safety Disclosure

155

Item 16I.

 

Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

155

PART III

 

 

156

Item 17

 

Financial Statements

156

Item 18

 

Financial Statements

156

Item 19

 

Exhibits

157

 

 

iii

 


GENERAL INFORMATION

In this annual report on Form 20-F (“Annual Report”), “NuCana,” “NuCana plc,” the “Group,” the “Company,” “we,” “us” and “our” refer to NuCana plc and its consolidated subsidiaries, except where the context otherwise requires.

NuCana® and Acelarin® are our registered trademarks and ProTidesTM is our trademark.

PRESENTATION OF FINANCIAL AND OTHER DATA

The consolidated financial statement data as at December 31, 2021, 2020, 2019, 2018, and 2017 and for the years ended December 31, 2021, 2020, 2019, 2018, and 2017 have been derived from our consolidated financial statements, which have been prepared in accordance with International Financial Reporting Standards, or IFRS, as issued by the International Accounting Standards Board, or IASB and audited in accordance with the standards of the Public Company Accounting Oversight Board (United States).  The financial statement data as at December 31, 2019, 2018 and 2017 and for the years ended December 31, 2018 and 2017 have been derived from our consolidated financial statements, which are not presented herein, which have also been prepared in accordance with IFRS as issued by IASB.

All references in this Annual Report to “$” are to U.S. dollars and all references to “£” are to pounds sterling.

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report contains estimates and forward-looking statements, principally in the sections titled “Risk Factors,” “Operating and Financial Review and Prospects” and “Business.” Some of the matters discussed concerning our operations and financial performance include forward-looking statements and estimates within the meaning of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended. The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect” and similar words are intended to identify forward-looking statements and estimates. Forward-looking statements include, but are not limited to, statements about:

 

the development of NUC-3373 and NUC-7738, as well as Acelarin, including statements regarding the expected initiation, timing, progress and availability of data from our clinical trials;

 

the potential attributes and benefit of our ProTides and their competitive positions;

 

our ability to successfully commercialize our ProTides, if approved;

 

our estimates regarding expenses, capital requirements and our need for additional financing;

 

our ability to acquire or in-license new product candidates;

 

potential collaborations; and

 

the duration and strength of our patent portfolio.

These forward-looking statements are subject to known and unknown risks, uncertainties, assumptions and other factors that could cause our actual results of operations, financial condition, liquidity, performance, prospects, opportunities, achievements or industry results, as well as those of the markets we serve or intend to serve, to differ materially from those expressed in, or suggested by, these forward-looking statements. Factors that could cause actual results, financial condition, liquidity, performance, prospects, opportunities, achievements or industry results to differ materially include, but are not limited to, those discussed under “Risk Factors” in this Annual Report. Additional risks that we may currently deem immaterial or that are not presently known to us could also cause the forward-looking events discussed in this Annual Report not to occur. These forward-looking statements are based on assumptions regarding our present and future business strategies and the environment in which we expect to operate in the future.

Forward-looking statements and estimates speak only at the date they were made, and we undertake no obligation to update or to review any forward-looking statement or estimate because of new information, future events or other factors. Forward-looking statements and estimates involve risks and uncertainties and are not guarantees of future performance. Our future results may differ materially from those expressed in these forward-looking statements and estimates.

iv

 


The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect” and similar words are intended to identify estimates and forward-looking statements. Estimates and forward-looking statements speak only at the date they were made, and we undertake no obligation to update or to review any estimate and/or forward-looking statement because of new information, future events or other factors. Estimates and forward-looking statements involve risks and uncertainties and are not guarantees of future performance. Our future results may differ materially from those expressed in these estimates and forward-looking statements. In light of the risks and uncertainties described above, the estimates and forward-looking statements discussed in this Annual Report might not occur, and our future results and our performance may differ materially from those expressed in these forward-looking statements due to, inclusive of, but not limited to, the factors mentioned above. Because of these uncertainties, you should not make any investment decision based on these estimates and forward-looking statements.

WEBSITE DISCLOSURE

We maintain a public website at https://www.nucana.com and use our website as a routine channel of distribution of company information, including press releases, analyst presentations, and supplemental financial information, as a means of disclosing material non-public information and for complying with our disclosure obligations under Regulation FD. Our website includes an Investors section through which we make available, free of charge, our Annual Reports on Form 20-F, Reports on Form 6-K, as well as any amendments to those reports filed or furnished pursuant to the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Accordingly, investors should monitor our website in addition to following press releases, filings with the SEC, and public conference calls and webcasts.

None of the information provided on our website, in our press releases or public conference calls and webcasts or through social media is incorporated into, or deemed to be a part of, this Annual Report or in any other report or document we file with the SEC, and any references to such website is intended to be inactive textual references only.

 

 

v

 


 

PART I

Item 1.

Identity of Directors, Senior Management and Advisers

Not Applicable.

Item 2.

Offer Statistics and Expected Timetable

Not Applicable.

Item 3.

Key Information

A.

Selected Financial Data

The following tables summarize our consolidated financial data as of the dates and for the periods indicated. The consolidated financial data as of and for the years ended December 31, 2021, 2020, 2019, 2018 and 2017 have been derived from our consolidated financial statements, which have been prepared in accordance with International Financial Reporting Standards, or IFRS, as issued by the International Accounting Standard Board, or IASB, and audited in accordance with the standards of the Public Company Accounting Oversight Board (United States).

Our historical results are not necessarily indicative of the results that may be expected in the future. The following selected consolidated financial data should be read in conjunction with Item 5, “Operating and Financial Review and Prospects” and our consolidated financial statements included elsewhere in this Annual Report.

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

 

2019

 

 

2018

 

 

2017

 

 

 

(in thousands, except per share data)

 

Consolidated statement of operations

   and comprehensive loss data:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development expenses

 

£

(36,834

)

 

£

(25,899

)

 

£

(19,728

)

 

£

(16,846

)

 

£

(17,673

)

Administrative expenses

 

 

(8,529

)

 

 

(7,050

)

 

 

(5,953

)

 

 

(5,184

)

 

 

(4,573

)

Impairment of intangible assets

 

 

(2,809

)

 

 

 

 

 

 

 

 

 

 

 

 

Initial public offering related expenses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1,794

)

Net foreign exchange gains (losses)

 

 

267

 

 

 

(3,472

)

 

 

(1,019

)

 

 

2,902

 

 

 

(1,654

)

Operating loss

 

 

(47,905

)

 

 

(36,421

)

 

 

(26,700

)

 

 

(19,128

)

 

 

(25,694

)

Finance income

 

 

103

 

 

 

246

 

 

 

1,049

 

 

 

1,065

 

 

 

208

 

Loss before tax

 

 

(47,802

)

 

 

(36,175

)

 

 

(25,651

)

 

 

(18,063

)

 

 

(25,486

)

Income tax credit

 

 

7,269

 

 

 

5,493

 

 

 

4,239

 

 

 

4,223

 

 

 

2,401

 

Loss for the year

 

 

(40,533

)

 

 

(30,682

)

 

 

(21,412

)

 

 

(13,840

)

 

 

(23,085

)

Other comprehensive income (expense):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Items that may be reclassified subsequently to profit or loss:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exchange differences on translation of foreign operations

 

 

5

 

 

 

(12

)

 

 

(11

)

 

 

12

 

 

 

(8

)

Total comprehensive loss for the year

 

£

(40,528

)

 

£

(30,694

)

 

£

(21,423

)

 

£

(13,828

)

 

£

(23,093

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic and diluted loss per share

 

£

(0.78

)

 

£

(0.81

)

 

£

(0.66

)

 

£

(0.43

)

 

£

(0.89

)

1

 


 

 

 

 

As of December 31,

 

 

 

2021

 

 

2020

 

 

2019

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Consolidated statement of financial

   position data:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

£

60,264

 

 

£

87,356

 

 

£

51,962

 

 

£

76,972

 

 

£

86,703

 

Total assets

 

 

77,474

 

 

 

107,792

 

 

 

70,268

 

 

 

87,185

 

 

 

96,355

 

Share capital

 

 

2,087

 

 

 

2,047

 

 

 

1,299

 

 

 

1,289

 

 

 

1,272

 

Share premium

 

 

141,050

 

 

 

140,890

 

 

 

79,541

 

 

 

79,426

 

 

 

79,236

 

Accumulated deficit

 

 

(149,726

)

 

 

(110,594

)

 

 

(80,055

)

 

 

(58,813

)

 

 

(45,159

)

Capital reserve (1)

 

 

42,466

 

 

 

42,466

 

 

 

42,466

 

 

 

42,466

 

 

 

42,466

 

Net assets/Total equity attributable to

   equity holders of the Company

 

 

65,548

 

 

 

99,230

 

 

 

63,522

 

 

 

81,594

 

 

 

93,420

 

Total liabilities

 

 

(11,926

)

 

 

(8,562

)

 

 

(6,746

)

 

 

(5,591

)

 

 

(2,935

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Number of shares

 

 

52,180

 

 

 

51,175

 

 

 

32,479

 

 

 

32,226

 

 

 

31,811

 

 

(1)

The capital reserve balance arose from the impact of the reduction of our share premium account and corresponding increase to our capital reserve account reflected as of December 31, 2017 in connection with our re-registration as a public limited company, as further described in footnote 13 to the consolidated financial statements.

B.

Capitalization and Indebtedness

Not Applicable.

C.

Reasons for the Offer and Use of Proceeds

Not Applicable.

D.

Risk Factors

Our business has significant risks. You should carefully consider the following risk factors and all other information contained in our Annual Report on Form 20-F for the year ended December 31, 2021 (our “Annual Report”) and in subsequent reports filed on Form 6-K, including our consolidated financial statements and the related notes. The risks and uncertainties described below are those significant risk factors, currently known and specific to us, that we believe are relevant to our business, results of operations and financial condition. If any of these risks materialize, our business, results of operations or financial condition could suffer and the price of the ADSs could decline. Additional risks and uncertainties not currently known to us or that we now deem immaterial may also harm us and adversely affect our business, results of operations and financial condition.

Summary of Risk Factors

An investment in our ADSs is subject to a number of risks, including risks related to our business and industry, risks related to development of our product candidates, and risks related to our ADSs. The following summarizes some, but not all, of these risks. Please carefully consider all of the information discussed in our Annual Report and in subsequent reports filed on Form 6-K for a more thorough description of these and other risks.

Risks Related to Our Business and Industry

 

We have incurred significant operating losses since our inception. We expect to incur losses for the foreseeable future and may never achieve or maintain profitability.

 

We depend heavily on the success of our product candidates NUC-3373 and NUC-7738. We cannot give any assurance that these product candidates will receive regulatory approval for any indication, which is necessary before any of them can be commercialized. If we, and any collaborators with whom we may enter into agreements for the development and commercialization of any of these product candidates, are unable to commercialize them, or experience significant delays in doing so, our ability to generate revenue and our financial condition will be adversely affected.

2

 


 

 

Our lack of any approved products may make it difficult for you to evaluate the success of our business to date and to assess our future viability.

 

Our business could be significantly and adversely affected by the COVID-19 pandemic.

 

Exchange rate fluctuations may adversely affect our results of operations and financial condition.

 

The conflict in Ukraine could adversely impact our business, in particular with respect to enrollment and data collection in any clinical trials of our product candidates conducted in Ukraine, Russia or Belarus.

Risks Related to Development of Our Product Candidates

 

Initial success in the ongoing and completed early-stage clinical trials may not be indicative of results obtained when these trials are completed or in later stage trials.

 

Drug development involves a lengthy and expensive process, with an uncertain outcome. We may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and may experience delays in obtaining, or ultimately be unable to obtain, the approval of our product candidates.

 

Due to our limited resources and access to capital, we must, and have in the past decided to, prioritize development of certain ProTide candidates over other potential candidates and certain indications over other potential indications. These decisions may prove to have been wrong and may adversely affect our performance.

 

We may not be successful in our efforts to use and expand our technology platform to build a pipeline of additional ProTide candidates.

Risks Related to Marketing Approval of Our Product Candidates

 

If we are not able to obtain, or if there are delays in obtaining, required marketing approvals, we will not be able to commercialize our product candidates and our ability to generate revenue will be impaired.

 

Our product candidates may cause undesirable side effects that could delay or prevent their marketing approval, limit the commercial profile of an approved label, or result in significant negative consequences following marketing approval, if any.

 

Any product candidate for which we obtain marketing approval will be subject to extensive post-marketing regulatory requirements and could be subject to post-marketing restrictions or withdrawal from the market, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our products, when and if any of them are approved.

Risks Related to Our Dependence on Third Parties 

 

We rely on, and expect to continue to rely on, third parties to conduct our clinical trials for our product candidates. If these third parties do not successfully carry out their contractual duties, comply with regulatory requirements or meet expected deadlines, we may not be able to obtain marketing approval for or commercialize our product candidates, and our business could be substantially harmed. 

 

We contract with third parties for the manufacture and shipment of our product candidates for preclinical studies and clinical trials and expect to continue to do so for commercialization. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or drugs or such quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.

 

If we fail to comply with our obligations under our license and collaboration agreement with Cardiff ProTides Ltd., we could lose rights to licensed and assigned intellectual property that are necessary for developing and commercializing certain potential product candidates.

Risks Related to the Commercialization of Our Product Candidates

 

Even if any of our product candidates receives marketing approval, it may fail to achieve the degree of market acceptance by physicians, patients, third-party payors and others in the medical community necessary for commercial success.

3

 


 

 

We face substantial competition, which may result in others discovering, developing or commercializing competing products before or more successfully than we do.

 

Even if we are able to commercialize any product candidates, such drugs may become subject to unfavorable pricing regulations or third-party coverage and reimbursement policies.

Risks Related to Our Intellectual Property

 

If we are unable to obtain and maintain intellectual property protection for our technology and products, or if the scope of the intellectual property protection obtained is not sufficiently broad, our competitors could commercialize technology and products similar or identical to ours, and our ability to successfully commercialize our technology and products may be impaired. In addition, if we infringe the valid patent rights of others, we may be prevented from making, using or selling our products or may be subject to damages or penalties.

 

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest, and our business may be adversely affected.

 

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

 

Our proprietary information, or that of our suppliers and any future collaborators, may be lost or we may suffer security breaches.

Risks Related to Employee Matters, Managing Growth and Other Risks Related to Our Business

 

We currently have a limited number of employees, and our future success depends on our ability to retain key executives and to attract, retain and motivate qualified personnel.

 

We expect to expand our development and regulatory capabilities and potentially implement sales, marketing and distribution capabilities, and as a result, we may encounter difficulties in managing our growth, which could disrupt our operations.

Risks Related to the ADSs

 

The price of our ADSs may be volatile and may fluctuate due to factors beyond our control.

 

We will continue to incur increased costs as a result of operating as a public company in the United States, and our management is required to devote substantial time to new compliance initiatives and corporate governance practices.

 

Certain of our existing shareholders, members of our board of directors and senior management maintain the ability to exercise significant control over us. Your interests may conflict with the interests of these existing shareholders.

 

Future sales, or the possibility of future sales, of a substantial number of our ADSs or ordinary shares could adversely affect the price of our ADSs.

 

Holders of our ADSs may be subject to limitations on transfer of their ADSs.

Risks Related to Our Business and Industry

We have incurred significant operating losses since our inception. We expect to incur losses for the foreseeable future and may never achieve or maintain profitability.

We have incurred significant operating losses since our inception. We incurred net losses of £23.1 million for the year ended December 31, 2017, £13.8 million for the year ended December 31, 2018, £21.4 million for the year ended December 31, 2019, £30.7 million for the year ended December 31, 2020, and £40.5 million for the year ended December 31, 2021. As of December 31, 2021, we had an accumulated deficit of £149.7 million. Our product candidate NUC-3373 is currently in a Phase 1b/2 clinical trial for patients with advanced colorectal cancer. Our product candidate NUC-7738 is currently in a Phase 1/2 clinical trial for patients with advanced solid tumors. It may be several years, if ever, before we have a product candidate ready for commercialization. To date, we have financed our operations primarily through public and

4

 


 

private placements of our equity securities. We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future. The net losses we incur may fluctuate significantly from quarter to quarter. We anticipate that our expenses will increase substantially if and as we:

 

continue development of our ProTides, including initiating additional clinical trials of NUC-3373 and NUC-7738;

 

complete preclinical studies and potentially initiate clinical trials of our preclinical-stage product candidates;

 

identify and develop new product candidates;

 

establish a robust supply chain for the manufacture of our product candidates in accordance with current good manufacturing practice, or cGMP;

 

seek marketing approvals for our product candidates that successfully complete clinical trials;

 

establish a sales, marketing and distribution infrastructure to commercialize any products for which we obtain marketing approval;

 

pursue market acceptance of our product candidates in the medical community and with third-party payors;

 

maintain, expand and protect our intellectual property portfolio;

 

expand our headcount by recruiting personnel to drive our clinical development programs and effectively manage out-sourced development activities;

 

enter into collaboration arrangements, if any, for the development of our product candidates or in-license other products and technologies;

 

achieve milestones which will trigger payments under our license agreements; and

 

add operational, financial and management information systems and personnel, including personnel to support our product development and planned future commercialization efforts.

Because of the numerous risks and uncertainties associated with developing new pharmaceutical drugs, we are unable to predict the extent of any future losses or when we will become profitable, if at all. In addition, our expenses could increase beyond expectations if we are required by the Food and Drug Administration, or FDA, the European Medicines Agency, or EMA, or other foreign regulatory agencies, to perform studies and clinical trials in addition to those that we currently anticipate, or if there are any delays in the completion of planned clinical trials or the development of any of our ProTides.

To become and remain profitable, we must develop and eventually commercialize products with significant market potential. This will require us to be successful in a range of challenging activities, including the following:

 

completing clinical trials of our product candidates that achieve their clinical endpoints;

 

obtaining marketing approval for our product candidates;

 

manufacturing, marketing and selling those products for which we may obtain marketing approval; and

 

achieving market acceptance of our product candidates in the medical community and with third-party payors.

We may never succeed in these activities and, even if we do, may never generate revenues that are significant or large enough to achieve profitability. If we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of the company and could impair our ability to raise capital, maintain our discovery and preclinical development efforts, expand our business or continue our operations and may require us to raise additional capital that may dilute your ownership interest. A decline in the value of the company could also cause you to lose all or part of your investment.

5

 


 

We depend heavily on the success of our product candidates NUC-3373 and NUC-7738. We cannot give any assurance that these product candidates will receive regulatory approval for any indication, which is necessary before any of them can be commercialized. If we, and any collaborators with whom we may enter into agreements for the development and commercialization of any of these product candidates, are unable to commercialize them, or experience significant delays in doing so, our ability to generate revenue and our financial condition will be adversely affected.

We do not currently generate any revenues from sales of any products, and we may never be able to develop or commercialize a marketable product. We have invested substantially all of our efforts and financial resources to date in the development of NUC-3373 and NUC-7738, as well as Acelarin, for which we discontinued the NuTide:121 clinical trial in March 2022. Our ability to generate product revenues, which we do not expect will occur for at least the next several years, if ever, will depend heavily on the successful development and eventual commercialization of these product candidates, if approved, which may never occur. Each of NUC-3373 and NUC-7738 will require additional clinical development, management of clinical, preclinical and manufacturing activities, regulatory approval in multiple jurisdictions, procurement of manufacturing supply, commercialization, substantial additional investment and significant marketing efforts before we generate any revenues from product sales, if at all. We are not permitted to market or promote any product candidates in the United States, Europe or other countries before we receive regulatory approval from the FDA, the EMA or comparable foreign regulatory authorities, and we may never receive such regulatory approval for  NUC-3373, NUC-7738 or any future product candidate. We have not submitted a New Drug Application, or NDA, to the FDA, a Marketing Authorization Application, or MAA, to the EMA or comparable applications to other regulatory authorities for any of our product candidates and do not expect to be in a position to do so in the foreseeable future. The success of our product candidates will depend on many factors, including the following:

 

we may not be able to demonstrate that the product candidate is safe and effective as a treatment for our targeted indications to the satisfaction of the applicable regulatory authorities;

 

the applicable regulatory authorities may require additional preclinical or clinical trials of the product candidate, including additional toxicology trials, which would increase our costs and prolong our development;

 

the results of clinical trials of our product candidates may not meet the level of statistical or clinical significance required by the applicable regulatory authorities for marketing approval;

 

the applicable regulatory authorities may disagree with the number, design, size, conduct or implementation of our planned clinical trials;

 

the contract research organizations, or CROs, that we retain to conduct clinical trials may take actions outside of our control that adversely impact our clinical trials;

 

the applicable regulatory authorities may not find the data from preclinical studies and clinical trials sufficient to demonstrate that the clinical and other benefits of the product candidate outweigh its safety risks;

 

the applicable regulatory authorities may disagree with our interpretation of data from preclinical studies and clinical trials or may require that we conduct additional studies;

 

the applicable regulatory authorities may not accept data generated at our clinical trial sites;

 

if we submit an NDA to the FDA or an MAA to the EMA, and it is reviewed by an advisory committee, the advisory committee may recommend against approval of our application or may recommend that the FDA or the EMA require, as a condition of approval, additional preclinical studies or clinical trials, limitations on approved labeling or distribution and use restrictions;

 

the applicable regulatory authorities may require development of a risk evaluation and mitigation strategy, or REMS, as a condition of approval;

 

the applicable regulatory authorities may change its approval policies or adopt new regulations;

 

the applicable regulatory authorities may identify deficiencies in our formulation and manufacturing processes or facilities of our third-party manufacturers;

 

we may face delays in our formulation and manufacturing process as a result of having not yet optimized formulations or due to lack of availability of starting materials;

 

we may be unable to scale up the manufacture process for some of our product candidates;

 

we may face challenges on the safe and appropriate administration of our drugs in the clinic, including with respect to the conversion of our product candidates from a dry powder formulation to a liquid formulation prior

6

 


 

 

to intravenous, or IV, administration, precipitation or other blockages in IV infusion lines, and the handling and storage of the IV infusion bags containing our product candidates, any of which may result in the need to carry out additional studies on the administration and compatibility of our product candidates with infusion sets and pumps;

 

we may be faced with challenges from third parties with respect to our right to use certain processes used in the formulation and process development of our product candidates;

 

we may have to defend our patents against infringement by third parties;

 

we may unknowingly infringe third-party patents;

 

we may face a “freedom to operate” issue;

 

we will be dependent on the efforts of third parties in completing clinical trials of, receiving regulatory approval for and commercializing, any product candidate we license to such third parties;

 

through our clinical trials, we may discover factors that limit the commercial viability of the product candidate or make its commercialization unfeasible;

 

we may not be successful in completing preclinical studies and clinical trials of, receiving marketing approvals for, establishing commercial manufacturing capabilities for and commercializing, any product candidate to which we retain rights under a collaboration agreement; and

 

we may not be successful in gaining acceptance of any product candidate by patients, the medical community and third-party payors, effectively competing with other therapies, maintaining a continued acceptable safety profile following approval and qualifying for, maintaining, enforcing and defending our intellectual property rights and claims.

With respect to each of NUC-3373 and NUC-7738, if we or our suppliers, as applicable, do not overcome one or more of these factors in a timely manner or at all, we could experience significant delays or an inability to successfully commercialize that product candidate.

We cannot be certain that NUC-3373 or NUC-7738 or any future product candidates will be successful in clinical trials or receive regulatory approval. Further, NUC-3373 or NUC-7738 or any future product candidates may not receive regulatory approval even if they are successful in clinical trials. If we do not receive regulatory approvals for NUC-3373 or NUC-7738 or any future product candidates, we may not be able to continue our operations. Even if we successfully obtain regulatory approvals to manufacture and market NUC-3373 or NUC-7738 or any future product candidates, our revenues will be dependent, in part, upon the size of the markets in the territories for which we gain regulatory approval and have commercial rights. If the markets for patient groups that we are targeting are not as significant as we estimate, we may not generate significant revenues from sales of such products, if approved.

We plan to seek regulatory approval to commercialize NUC-3373 and NUC-7738 in the United States and the European Union, and potentially in additional foreign countries. While the scope of regulatory approval is similar in many countries, to obtain separate regulatory approval in multiple countries requires us to comply with the numerous and varying regulatory requirements of such countries regarding safety and efficacy and governing, among other things, clinical trials, commercial sales, pricing and distribution of NUC-3373 and NUC-7738, and we cannot predict success in these jurisdictions.

Products studied for their safety and effectiveness in treating serious or life-threatening illnesses and that provide meaningful therapeutic benefit over existing treatments may receive accelerated approval from the FDA and may be approved on the basis of adequate and well-controlled clinical trials establishing that the drug product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit or an effect on an intermediate clinical endpoint that can be measured earlier than an effect on irreversible morbidity or mortality. Discussions with the FDA about the feasibility of an accelerated approval typically begin early in the development of a new drug or biological product in order to identify, among other things, an appropriate surrogate or intermediate clinical endpoint.

However, even if we were to generate clinical data sufficient to support an NDA submission seeking accelerated approval for any of our product candidates, there can be no assurance that such marketing application will be accepted by the FDA for substantive review or that approval will be granted on a timely basis, or at all. In addition, if another company receives full approval from the FDA to market a product for treatment of a similar indication to our product candidate, our ability to seek and obtain accelerated approval for our product candidate in the same or similar indication may be materially adversely affected. The FDA or foreign regulatory authorities also could require us to conduct further studies or trials prior to

7

 


 

considering our application or granting a marketing approval of any type. We might not be able to fulfill the FDA’s requirements in a timely manner, which would cause delays, or approval might not be granted because our submission is deemed incomplete by the FDA. A failure to obtain accelerated approval for any of our product candidates would result in a longer time period to obtain approval for and commercialize such product candidate, could increase the cost of development of such product candidates and could harm our competitive position in the marketplace.

Even if we were to receive accelerated approval from the FDA for any of our other product candidates, we will be subject to rigorous post-marketing requirements, including the submission of confirmatory clinical data verifying the clinical benefit of the product. Drug products marketed under an accelerated approval NDA also are subject to a requirement that all promotional materials must be submitted to the FDA at least 30 days prior to their dissemination. The FDA could seek to withdraw accelerated approval for multiple reasons, including if we fail to conduct the required post-marketing study with due diligence, the post-marketing study fails to verify the product’s clinical benefit, other evidence shows that the product is not safe or effective under the conditions of use, or we disseminate promotional materials that are found by the FDA to be false and misleading.

Our lack of any approved products may make it difficult for you to evaluate the success of our business to date and to assess our future viability.

Biopharmaceutical drug development is a highly speculative undertaking and involves a substantial degree of risk. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, developing our technology, identifying potential product candidates, undertaking preclinical studies, and conducting clinical trials of our product candidates. We have not yet demonstrated our ability to successfully complete large-scale, randomized, pivotal clinical trials compared to standards of care, obtain marketing approvals, manufacture a commercial scale product, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities necessary for successful product commercialization. Typically, it takes several years to develop one new drug from the time it is discovered to when it is available for treating patients. In addition, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors. We will need to transition from a company with a research and development focus to a company capable of supporting commercial activities. We may not be successful in such a transition.

We will require substantial additional funding which may not be available to us on acceptable terms, or at all. If we fail to obtain additional financing, we may be unable to complete the development and commercialization of our product candidates or continue our development programs.

The development of pharmaceutical drugs is capital-intensive. We expect our expenses to increase with our ongoing activities, particularly as we conduct larger-scale clinical trials of, and seek marketing approval for, our product candidates. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution. We may also need to raise additional funds sooner if we choose to pursue additional indications or geographies for our product candidates or otherwise expand more rapidly than we presently anticipate. Furthermore, we will continue to incur costs associated with operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations.

As of December 31, 2021, we had £60.3 million in cash and cash equivalents. We believe, based upon our current operating plan, that, our cash and cash equivalents on hand will be sufficient to fund our anticipated operations for at least the next twelve months. Our future capital requirements and the period for which we expect our existing resources to support our operations may vary significantly from what we expect. Our monthly spending levels vary based on new and ongoing research and development and other corporate activities. Because the length of time and activities associated with successful research and development of our product candidates is highly uncertain, we are unable to estimate the actual funds we will require for development and any approved marketing and commercialization activities. In addition, our future capital requirements will depend on many factors, and could increase significantly as a result of many factors, including: 

 

the scope, progress, results and costs of preclinical development, laboratory testing and clinical trials for our product candidates;

 

the scope, prioritization and number of our research and development programs;

 

the costs, timing and outcome of regulatory review of our product candidates;

 

the extent to which we enter into non-exclusive, jointly funded clinical research collaboration arrangements, if any, for the development of our product candidates in combination with other companies’ products;

8

 


 

 

our ability to establish collaboration arrangements for the development of our product candidates on favorable terms, if at all;

 

the achievement of milestones or occurrence of other developments that trigger payments under our license agreements and any collaboration agreements into which we may enter, if any;

 

the extent to which we are obligated to reimburse, or entitled to reimbursement of, clinical trial costs under future collaboration agreements, if any;

 

the extent to which we acquire or in-license product candidates and technologies, and the terms of such in-licenses;

 

the costs of future commercialization activities, including product sales, marketing, manufacturing and distribution, for any of our product candidates for which we receive marketing approval;

 

revenue, if any, received from commercial sales of our product candidates, should any of our product candidates receive marketing approval; and

 

the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims.

Conducting preclinical studies and clinical trials is a time-consuming, expensive and uncertain process that can take years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve product sales. In addition, our product candidates, if approved, may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of products that may not be commercially available for several years, if ever. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives.

Any additional fundraising efforts may divert our management from their day-to-day activities, which may adversely affect our ability to develop and commercialize our product candidates. Volatility in the financial markets has generally made equity and debt financing more difficult to obtain and may compromise our ability to meet our fundraising needs. We cannot guarantee that future financing will be available in sufficient amounts or on terms acceptable to us, if at all.

If we are unable to obtain funding on a timely basis, we may be required to significantly curtail, delay or discontinue one or more of our research or development programs or the commercialization of any product candidate or be unable to expand our operations or otherwise capitalize on our business opportunities.

Raising additional capital may cause dilution to our shareholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity and debt financings. The sale of additional equity or convertible debt securities would dilute all of our shareholders. The incurrence of indebtedness could result in increased fixed payment obligations, and we may be required to agree to certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire, sell or license intellectual property rights, limitations on declaring dividends and other operating restrictions that could adversely impact our ability to conduct our business. Moreover, the terms of any financing may adversely affect the holdings or the rights of our shareholders and the issuance of additional securities, whether equity or debt, by us, or the possibility of such issuance, may cause the market price of our ADSs to decline.

We could decide to seek funds through collaborations, strategic alliances or licensing arrangements with third parties, and we could be required to do so at an earlier stage than otherwise would be desirable. In connection with any such collaborations, strategic alliances or licensing arrangements, we may be required to relinquish valuable rights to our intellectual property, future revenue streams, research programs or product candidates, grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves, or otherwise agree to terms unfavorable to us.

9

 


 

Inadequate funding for the FDA, the SEC and other, government agencies could hinder such agencies’ ability to hire and retain key leadership and other personnel, prevent new products and services from being developed or commercialized in a timely manner or otherwise prevent those agencies from performing normal business functions on which the operation of our business may rely, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of the SEC and other government agencies on which our operations may rely, including those that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary government agencies, which would adversely affect our business. For example, over the last several years, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA and the SEC, have had to furlough critical FDA, SEC and other government employees and stop critical activities. Moreover, recent shutdowns or slowdowns in normal agency work caused by the federal response to the COVID-19 public health emergency can increase the time needed for the agency to complete its review or make final approval or other administrative decisions. If a prolonged government shutdown or slowdown occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business. Further, in our operations as a public company, future government shutdowns could impact our ability to access the public market and obtain necessary capital in order to properly capitalize and continue our operations.

We may be unable to use net operating loss and tax credit carryforwards and certain built-in losses to reduce future tax payments or benefit from favorable United Kingdom tax legislation.

As a United Kingdom resident company, we are subject to U.K. corporate taxation. We have generated losses since inception. As of December 31, 2021, we had cumulative carry forward tax losses of £70.3 million. Subject to any relevant restrictions, including the Corporate Income Loss Restriction and the Corporate Capital Loss Restriction that, broadly, restrict the amount of carried forward losses that can be utilized to 50% of group profits or gains arising above £5.0 million per tax year, we expect these to be available to carry forward and offset against future operating profits.

As a company that carries out extensive research and development activities, we benefit from the United Kingdom research and development tax credit regime for small and medium-sized companies, whereby we are able to surrender the trading losses that arise from our qualifying research and development activities for a payable tax credit of up to 33.35% of eligible research and development expenditures. Qualifying expenditures largely comprise employment costs for research staff, consumables and subcontract costs incurred as part of research projects. Certain subcontracted qualifying research expenditures are eligible for a cash rebate of up to 21.68%. The majority of our pipeline research, clinical trials management and manufacturing development activities are currently eligible for inclusion within these tax credit cash rebate claims. Following Royal Assent of the Finance Act 2021, legislation is now in force which applies a cap on payable credit claims in excess of £20,000 in relation to accounting periods beginning on or after April 1, 2021 by reference to, broadly, three times the total Pay As You Earn (PAYE) and national insurance contributions (NICs) liability of the company. Unless an exemption applies, this could restrict the amount of payable credit that we claim going forwards. The U.K. Government is considering further reforms to the U.K.’s research and development tax relief system, and these reforms may also affect our ability to claim such relief in the future. In particular, the U.K. Government intends to refocus the relief on activity carried out in the U.K. Whilst an exemption from any territoriality requirement for overseas clinical trials is expected to be included in the legislation, the draft legislation is yet to be published. The extent of any such exemption and therefore our ability to claim relief in respect of certain costs in the future is uncertain. Also, we may not be able to continue to claim payable research and development tax credits in the future because we may no longer qualify as a small or medium-sized company.

We may benefit in the future from the United Kingdom’s “patent box” regime, which allows certain profits attributable to revenues from patented products to be taxed at an effective rate of 10%. As we have many different patents covering our products, future upfront fees, milestone fees, product revenues and royalties could be taxed at this favorably low tax rate. When taken in combination with the enhanced relief available on our research and development expenditures, we expect a long-term lower rate of corporation tax to apply to us. If, however, there are unexpected adverse changes to the United Kingdom research and development tax credit regime or the “patent box” regime, or for any reason we are unable to qualify for such advantageous tax legislation, or we are unable to use net operating loss and tax credit carryforwards and certain built-in losses to reduce future tax payments then our business, results of operations and financial condition may be adversely affected.

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Tax authorities may disagree with our positions and conclusions regarding certain tax positions, or may apply existing rules in an arbitrary or unforeseen manner, resulting in unanticipated costs, taxes or non-realization of expected benefits.

A tax authority may disagree with tax positions that we have taken, which could result in increased tax liabilities. For example, Her Majesty’s Revenue & Customs (HMRC), the U.S. Internal Revenue Service or another tax authority could challenge our allocation of income by tax jurisdiction and the amounts paid between our affiliated companies pursuant to our intercompany arrangements and transfer pricing policies, including methodologies for valuing developed technology and amounts paid with respect to our intellectual property development. Similarly, a tax authority could assert that we are subject to tax in a jurisdiction where we believe we have not established a taxable connection, often referred to as a “permanent establishment” under international tax treaties, and such an assertion, if successful, could increase our expected tax liability in one or more jurisdictions.

A tax authority may take the position that material income tax liabilities, interest and penalties are payable by us, for example where there has been a technical violation of contradictory laws and regulations that are relatively new and have not been subject to extensive review or interpretation, in which case we expect that we might contest such assessment. Contesting such an assessment may be lengthy and costly and if we were unsuccessful in disputing the assessment, the implications could increase our anticipated effective tax rate, where applicable.

Changes and uncertainties in the tax system in the countries in which we have operations, could materially adversely affect our financial condition and results of operations, and reduce net returns to our shareholders.

We are unable to predict what tax reform may be proposed or enacted in the future or what effect such changes would have on our business, but such changes, to the extent they are brought into tax legislation, regulations, policies or practices in jurisdictions in which we operate or in the future into which we sell our products, could increase the estimated tax liability that we have expensed to date and paid or accrued on our balance sheets, and otherwise affect our financial position, future results of operations, cash flows in a particular period and overall or effective tax rates in the future in countries where we have operations or may sell our products, reduce post-tax returns to our shareholders and increase the complexity, burden and cost of tax compliance.

Our business may become subject to economic, political, regulatory and other risks associated with international operations.

As a company based in the United Kingdom, our business is subject to risks associated with conducting business internationally. Many of our suppliers and collaborative and clinical trial relationships are located outside the United States. Accordingly, our future results could be harmed by a variety of factors, including:

 

economic weakness, including inflation, or political instability;

 

differing and changing regulatory requirements for drug approvals;

 

differing jurisdictions could present different issues for securing, maintaining or obtaining freedom to operate in such jurisdictions;

 

potentially reduced protection for intellectual property rights;

 

difficulties in compliance with non-U.S. laws and regulations;

 

changes in regulations and customs, tariffs and trade barriers;

 

changes in currency exchange rates of the pound sterling, the euro and currency controls;

 

changes in a specific country’s or region’s political or economic environment, including the implications of the United Kingdom’s withdrawal from the European Union, or any potential future referendum regarding the independence of Scotland;

 

trade protection measures, import or export licensing requirements or other restrictive actions by U.S. or non-U.S. governments;

 

differing reimbursement regimes and price controls in certain non-U.S. markets;

 

negative consequences from changes in tax laws;

 

compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;

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workforce uncertainty in countries where labor unrest is more common than in the United States;

 

difficulties associated with staffing and managing international operations, including differing labor relations;

 

production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad;

 

business interruptions resulting from geo-political actions, including war and terrorism, or natural disasters including earthquakes, typhoons, floods and fires; and

 

changes in financial markets or general economic conditions, including the effects of recession or slow economic growth in the U.S. and abroad, interest rates, fuel prices, international currency fluctuations, corruption, political instability, acts of war, including the ongoing conflict in Ukraine and any potential spread of the conflict into a wider war, acts of terrorism, and the ongoing COVID-19 pandemic or other public health crises.

The COVID-19 pandemic or future pandemics or public health crises could adversely impact our business, including our preclinical studies and clinical trials.

Public health crises such as pandemics or similar outbreaks could adversely impact our business. The coronavirus, SARS-CoV-2, which causes COVID-19, and its variants have spread to every country in the world and throughout the United States and the United Kingdom. Many countries, as well as most states of the United States, reacted by instituting quarantines, “lockdowns” and other public health restrictions on leisure activities, work and travel. Although pandemic-related restrictions have been eased or removed in certain geographies, our business remains subject to pandemic-related controls, which may become more restrictive at any time. We rely on third-party manufacturers, distributors, information technology and software service providers, law and accounting firms, CROs, and consultants who are subject to, or may become subject to, pandemic-related controls. COVID-19 may also affect employees of third-party CROs located in affected geographies that we rely upon to carry out clinical trials. If these third parties cannot perform the services we require in a timely way and we cannot successfully implement replacements or workarounds, our business, results of operations, and financial condition could be harmed. As a result of the COVID-19 pandemic, or potential future pandemics, we have experienced and may in the future experience disruptions that could severely impact our business, preclinical studies and clinical trials, including:

 

delays or difficulties in enrolling patients in our clinical trials;

 

delays or difficulties in clinical site initiation, including difficulties in recruiting clinical site investigators and clinical site staff;

 

delays or disruptions in preclinical experiments and investigational new drug application-enabling good laboratory practice standard toxicology studies due to unforeseen circumstances at contract research organizations and vendors along their supply chain;

 

increased rates of patients withdrawing from our clinical trials following enrollment as a result of contracting COVID-19, being forced to quarantine, or not wanting to attend hospital visits;

 

diversion of healthcare resources away from the conduct of clinical trials, including the diversion of hospitals serving as our clinical trial sites and hospital staff supporting the conduct of our clinical trials;

 

interruption of key clinical trial activities, such as clinical trial site data monitoring, due to limitations on travel imposed or recommended by national, state or local governments, employers and others or interruption of clinical trial subject visits and study procedures (particularly any procedures that may be deemed non-essential), which may impact the integrity of subject data and clinical study endpoints;

 

interruption or delays in the operations of the U.S. Food and Drug Administration, the European Medicines Agency or other foreign regulatory agencies, which may impact approval timelines;

 

interruption of, or delays in receiving, supplies of our product candidates from our contract manufacturing organizations due to staffing shortages, production slowdowns or stoppages and disruptions in our supply chain or distribution vendors’ ability to ship product candidates; and

 

limitations on employee resources that would otherwise be focused on the conduct of our preclinical studies and clinical trials, including because of sickness of employees or their families, the desire of employees to avoid contact with large groups of people, an increased reliance on working from home or mass transit disruptions.

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These and other factors arising from the COVID-19 pandemic could worsen in countries that are already afflicted with COVID-19, could continue to spread to additional countries, or could return to countries where the pandemic has been partially contained, each of which could further adversely impact our ability to conduct clinical trials and our business generally, and could have a material adverse impact on our operations and financial condition and results.

In addition, the trading prices for our ADSs and for the securities of other biopharmaceutical companies have been highly volatile during certain periods as a result of the COVID-19 pandemic. As a result, we may face difficulties raising capital through sales of our ADSs or such sales may be on unfavorable terms. The COVID-19 pandemic continues to evolve. The extent to which this pandemic may impact our business, preclinical studies and clinical trials will depend on future developments, which are highly uncertain and cannot be predicted with confidence, such as the emergence, severity and spread of new variants of the disease, the duration of the pandemic and any outbreak of future variants, the potential imposition of travel restrictions and actions to contain the pandemic and any future outbreaks, such as social distancing and quarantines or lock-downs in the United Kingdom, the United States and other countries, business closures or business disruptions and the effectiveness of actions taken in the United Kingdom, the United States and other countries to contain and treat the disease.

The conflict in Ukraine could adversely impact our business, in particular with respect to enrollment and data collection in any clinical trials of our product candidates conducted in Ukraine, Russia or Belarus.

The ongoing military conflict in Ukraine could disrupt our clinical trials and increase our costs in this region.  Although the length and impacts of any military action are highly unpredictable, clinical trial sites in Ukraine, Russia and Belarus and neighboring countries could suspend or terminate their participation in trials, and patients and physicians could be forced to evacuate or voluntarily choose to relocate far from clinical trial sites, making them unavailable and potentially making data collection more difficult or not possible.  Any such difficulties at clinical trial sites, or the unavailability of such clinical trial sites, could result in delays in enrolling or completing clinical trials, the need to identify alternative clinical trial sites, and increased overall development costs.  In particular, our NuTide:121 Phase 3 clinical trial of Acelarin for patients with biliary tract cancer, which was discontinued in March 2022, included clinical trial sites in Ukraine and Russia, which may make further data collection and follow-up of patients at those sites more difficult or not possible.  Furthermore, the United States and its European allies have imposed significant new sanctions against Russia and Belarus, including embargoes, sanctions and other restrictions targeting major Russian financial institutions.  Our ability to conduct future clinical trials or purchases from suppliers located in Russia, Belarus and parts of Ukraine and elsewhere in the region may become restricted under applicable sanctions laws. All of the foregoing could impede the execution of our clinical development plans, which could materially harm our business.

Exchange rate fluctuations may adversely affect our results of operations and financial condition.

Owing to the international scope of our operations, fluctuations in exchange rates, particularly between the pound sterling and the U.S. dollar, may adversely affect us. Although we are based in the United Kingdom, we source our active pharmaceutical ingredient, or API, and other raw materials and our research and development, manufacturing, consulting and other services worldwide, including from the United States, the European Union and India. Any weakening of the pound sterling against the currencies of such other jurisdictions makes the purchase of such goods and services more expensive for us. Further, potential future revenue may be derived from abroad, particularly from the United States. As a result, our business and the price of our ADSs may be affected by fluctuations in foreign exchange rates not only between the pound sterling and the U.S. dollar, but also the currencies of other countries, which may have a significant impact on our results of operations and cash flows from period to period. Currently, we do not have any exchange rate hedging arrangements in place.

Our business may be negatively impacted by changes in the applicable regulatory regime.

We may face new regulatory costs and challenges that could have an adverse effect on our operations. The regulatory framework applicable to our operations and the development of our product candidates can change at any time as a result of political decisions. Any changes to the regulatory framework could have a material impact on our plans and development strategy, including our supply of investigational medicinal products. Furthermore, the withdrawal of the United Kingdom from the European Union and any other significant European political changes could result in disruption that could in turn delay the approval of new medicines at the European Medicines Agency.

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Risks Related to Development of Our Product Candidates

Initial success in the completed and ongoing early-stage clinical trials may not be indicative of results obtained when these trials are completed or in later stage trials.

NUC-3373 is currently being evaluated in a Phase 1b/2 study in patients with advanced colorectal cancer.  Favorable results obtained from our Phase 1 clinical trial of NUC-3373 in patients with advanced solid tumors and our ongoing Phase 1b/2 clinical trial of NUC-3373 in patients with advanced colorectal cancer may not be replicated in any future clinical trials.  Similarly, while NUC-7738 is currently being evaluated in a Phase 1/2 study for patients with advanced solid tumors, favorable results obtained to date may not be replicated in any future clinical trials.  In addition, data generated in these early-stage trials in particular are not the basis on which marketing approval by the FDA or a comparable foreign regulatory authority would be sought. Furthermore, the results of our clinical trials may not meet the level of statistical significance required by the FDA or comparable foreign regulatory authorities for marketing approval. Statistical significance means that an effect is unlikely to have occurred by chance. Clinical trial results are considered statistically significant when the probability of the results occurring by chance, rather than from the efficacy of the product candidate, is sufficiently low. There can be no assurance that any of our clinical trials will ultimately be successful or support further clinical development of any of our product candidates. There is a high failure rate for drugs proceeding through clinical trials. A number of companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in clinical development even after achieving promising results in earlier studies.

Preliminary and interim data from our clinical trials that we may announce or publish from time to time may change as patient enrollment continues, patient data are further examined and more patient data become available.

From time to time, we may announce or publish preliminary or interim data from our clinical studies, which include preliminary or interim data from our clinical trials, including those from the Phase 1b/2 trial of NUC-3373 for patients with advanced colorectal cancer, the Phase 1/2 trial of NUC-7738 for patients with advanced solid tumors, and any future clinical trials of any of product candidates. Preliminary and interim data from a clinical trial are not always entirely representative of final data. Preliminary and interim data are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues, patient data are further examined, more patient data become available, and we prepare and issue our final clinical study report. As a result, preliminary and interim data should be viewed with caution until the final data are available. Material adverse changes in the final data compared to the preliminary or interim data could significantly harm our business prospects.

We are relatively early in our development efforts. If we are unable to successfully develop and commercialize our product candidates or experience significant delays in doing so, our business will be harmed.

We currently do not have any products that have gained marketing approval. We have invested substantially all of our efforts and financial resources identifying and developing our ProTides, such as NUC-3373 and NUC-7738, as well as Acelarin for which we discontinued the NuTide:121 clinical trial in March 2022. Our ability to generate product revenues, which may not occur for several years, if ever, will depend on the successful development and eventual commercialization of our product candidates: NUC-3373, for which a Phase 1b/2 trial is ongoing; and NUC-7738, for which a Phase 1/2 trial is ongoing. We currently do not generate any revenues from sales of any products, and we may never be able to develop or commercialize a marketable drug. Each of our product candidates will require development, management of development and manufacturing activities, marketing approval in multiple jurisdictions, obtaining manufacturing supply, building of a commercial organization, substantial investment and significant marketing efforts before we generate any revenues from drug sales.

We have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. For example, to execute our business plan, we will need to successfully:

 

execute development activities for our product candidates, including successful enrollment in and completion of clinical trials;

 

manage our spending as costs and expenses increase due to preclinical development, clinical trials, marketing approvals and commercialization;

 

obtain required marketing approvals for the development and commercialization of our product candidates;

 

obtain and maintain patent and trade secret protection and regulatory exclusivity for our product candidates and ensure that we do not infringe the valid patent rights of third parties;

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protect, leverage and expand our intellectual property portfolio;

 

establish and maintain clinical and commercial manufacturing capabilities or make arrangements with third-party manufacturers for clinical and commercial manufacturing;

 

build and maintain robust sales, distribution and marketing capabilities, either on our own or in collaboration with strategic partners, if our product candidates are approved;

 

gain acceptance for our product candidates, if approved, by patients, the medical community and third-party payors;

 

compete effectively with other therapies;

 

obtain and maintain healthcare coverage and adequate reimbursement;

 

maintain a continued acceptable safety profile for our product candidates following approval, if approved; and

 

develop and maintain any strategic relationships we elect to enter into, if any.

If we do not achieve one or more of these factors in a timely manner or at all, we could experience significant delays or an inability to successfully commercialize our product candidates, which would harm our business. If we do not receive marketing approvals for our product candidates, we may not be able to continue our operations.

If we experience delays or difficulties in the enrollment of patients in clinical trials, development of our product candidates may be delayed or prevented.

Identifying and qualifying patients to participate in clinical trials for our product candidates is critical to our success. We may not be able to initiate or continue clinical trials for our product candidates if we are unable to locate and enroll a sufficient number of eligible patients to participate in these trials. Patient enrollment may be affected by many factors including:

 

the severity of the disease under investigation;

 

the size of the patient population for a product indication;

 

the eligibility criteria for the clinical trial in question;

 

the perceived risks and benefits of the product candidate under study;

 

the efforts to facilitate timely enrollment in clinical trials;

 

the patient referral practices of physicians;

 

the availability of competing therapies and clinical trials; and

 

the proximity and availability of clinical trial sites for prospective patients.

If we experience delays or difficulties in the enrollment of patients in clinical trials, including those that may be caused by the ongoing COVID-19 pandemic, our clinical trials may be delayed or terminated. Any delays in completing our clinical trials will increase our costs, delay or prevent our product candidate development and approval process, and jeopardize our ability to commence product sales and generate revenue.

Clinical drug development involves a lengthy and expensive process, with an uncertain outcome. We may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and may experience delays in obtaining, or ultimately be unable to obtain, the approval of our product candidates.

The risk of failure in drug development is high. NUC-3373 is currently being studied in a Phase 1b/2 trial, and NUC-7738 is in a Phase 1/2 trial. Before obtaining marketing approval from regulatory authorities for the sale of any product candidate, we must complete preclinical development and conduct extensive clinical trials to demonstrate the safety and efficacy of our product candidates in patients. Clinical trials are expensive, difficult to design and implement and can take several years to complete, and their outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. Further, the results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials, and interim results of a clinical trial do not necessarily predict final results. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses, and many companies that have

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believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval of their products. It is impossible to predict when or if any of our product candidates will prove effective or safe in humans or will receive marketing approval.

We may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize our product candidates. Clinical trials may be delayed, suspended or prematurely terminated because costs are greater than we anticipate or for a variety of reasons, such as:

 

the COVID-19 pandemic, which may affect the ability to initiate and/or complete preclinical studies or conduct ongoing clinical trials, and may delay initiation of planned and future clinical trials;

 

delay or failure in reaching agreement with the FDA, the EMA or a comparable foreign regulatory authority on a trial design that we are able to execute;

 

delay or failure in obtaining authorization to commence a trial or inability to comply with conditions imposed by a regulatory authority regarding the scope or design of a clinical trial;

 

delays in reaching, or failure to reach, agreement on acceptable terms with prospective trial sites and prospective CROs, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

 

inability, delay, or failure in identifying and maintaining a sufficient number of trial sites, many of which may already be engaged in other clinical programs;

 

delay or failure in recruiting and enrolling suitable subjects to participate in a trial;

 

delay or failure in having subjects complete a trial or return for post-treatment follow-up;

 

clinical sites and investigators deviating from the clinical protocol, failing to conduct the trial in accordance with regulatory requirements, or dropping out of a trial;

 

failure to initiate or delay of or failure to complete a clinical trial as a result of an Investigational New Drug Application, or IND, being placed on clinical hold by the FDA, or for other reasons;

 

lack of adequate funding to continue a clinical trial, including unforeseen costs due to enrollment delays, requirements to conduct additional clinical trials and increased expenses associated with the services of our CROs and other third parties;

 

clinical trials of our product candidates may produce negative or inconclusive results, and we may decide, or regulators may require us, to conduct additional clinical trials or abandon product development programs;

 

the number of patients required for clinical trials of our product candidates may be larger than we anticipate, enrollment in these clinical trials may be slower than we anticipate or participants may drop out of these clinical trials at a higher rate than we anticipate;

 

our third-party contractors may fail to comply with regulatory requirements or meet their contractual obligations to us in a timely manner, or at all;

 

regulators, or a Data Safety Monitoring Board, or DSMB, if one is used for our clinical trials, may require that we suspend or terminate our clinical trials for various reasons, including noncompliance with regulatory requirements, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug, or a finding that the participants are being exposed to unacceptable health risks;

 

the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be insufficient;

 

the FDA or other regulatory authorities may require us to submit additional data or impose other requirements before permitting us to initiate a clinical trial; or

 

there may be changes in governmental regulations or administrative actions.

 

Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of marketing approval for our product candidates. The FDA may disagree with our clinical trial design and our interpretation of data from clinical trials, or may change the requirements for approval even after it has reviewed and commented on the design for our clinical trials. For example, the FDA recently published guidance on “Project

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Optimus”, an initiative to reform dose selection in oncology drug development. If the FDA does not believe we have sufficiently demonstrated that the selected doses for our investigational products maximize not only the efficacy of the investigational product, but the safety and tolerability as well, our ability to initiate new studies may be delayed. Even if we conducted the additional studies or generated the additional information requested, the FDA could disagree that we have satisfied their requirements, all of which will cause significant delays and expense to our programs.

In addition, even though NUC-3373 is a transformation of a chemotherapeutic agent that has been widely used for many years and there is a clear unmet medical need in each of the indications that we are currently pursuing in the clinic, there can be no assurance that the FDA will permit us to move more quickly to the initiation of pivotal clinical trials in large patient populations. Furthermore, NUC-7738 is a transformation of 3’-deoxyadenosine, a nucleoside analog that has never been successfully developed or approved as a chemotherapy, which may result in the need for more preclinical studies or clinical trials than would be the case for transformations of approved chemotherapeutic agents.

If we are required to conduct additional clinical trials or other studies of our product candidates beyond those that we currently contemplate, if we are unable to successfully complete clinical trials of our product candidates or other studies, if the results of these trials or tests are not positive or are only modestly positive or if there are safety concerns, we may:

 

be delayed in obtaining marketing approval for our product candidates;

 

not obtain marketing approval for our product candidates at all;

 

obtain approval for indications or patient populations that are not as broad as intended or desired;

 

obtain approval with labeling that includes significant use or distribution restrictions or safety warnings that would reduce the potential market for our products or inhibit our ability to successfully commercialize our products;

 

be subject to additional post-marketing restrictions or requirements, including confirmatory trials; or

 

have the product removed from the market after obtaining marketing approval.

Our product development costs will also increase if we experience delays in preclinical and clinical development or receiving the requisite marketing approvals. We do not know whether any of our preclinical studies or clinical trials will need to be restructured or will be completed on schedule, or at all. Significant preclinical or clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize our product candidates or allow our competitors to bring products to market before we do and impair our ability to successfully commercialize our product candidates and may harm our business and results of operations.

We face regulation and potential liability related to the privacy of health information we obtain from clinical trials sponsored by us or our collaborators.

The regulatory environment surrounding information security and privacy is increasingly demanding, and these laws and regulations are increasing in complexity and number, and may change frequently and sometimes conflict. We are subject to numerous regulations governing the protection of personal and confidential information of our clinical trial subjects, clinical investigators, and employees, including in relation to medical records, credit card data and financial information, which encompass state privacy and confidentiality laws (including state laws requiring disclosure of breaches), federal and state consumer protection and employment laws, HIPAA, and European and other foreign data protection laws. For example, on May 25, 2018, the European General Data Protection Regulation, or GDPR, became applicable in all E.U. member states and member states of the European Economic Area, or E.E.A. Following the U.K.’s withdrawal from the E.U. on January 31, 2020, and the end of the transition period on December 31, 2020, the data protection obligations of the GDPR continue to apply to U.K.-related processing of personal data in substantially unvaried form and fashion (retained in U.K. law as the “U.K. GDPR”).

We are subject to the GDPR and/or U.K. GDPR when conducting clinical trials involving U.K. or E.E.A. based data subjects (whether the trials are conducted directly by us or through a clinical vendor or collaborator) or offering approved products (or any other products or services) to U.K. or E.E.A. based data subjects (regardless of whether involving a U.K. or E.E.A. based subsidiary or operations), when monitoring of their behavior of data subjects in the U.K. or E.E.A. and/or when acting through a U.K. or E.E.A. based subsidiary, operation or other establishment.

The GDPR (and U.K. GDPR) sets out a number of requirements that must be complied with when handling personal data (i.e. data relating to an identified or identifiable living individual) in these circumstances, including: the obligation to appoint data protection officers in certain circumstances; increased accountability and record-keeping obligations; increased

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transparency obligations for data controllers; the obligation to carry out so-called data protection impact assessments in certain circumstances; increased rights for data subjects (such as rights for individuals to be “forgotten”, rights to data portability, rights to object etc.); a heightened and more-codified standard of data subject consent; and the obligation to notify certain significant personal data breaches to the relevant Supervisory Authority(ies) and affected individuals. In addition, the GDPR materially expanded the definition of what is expressly provided to constitute personal data (including, for example, by expressly clarifying that the GDPR applies to ‘pseudonymized’ (i.e., key-coded) data).

The GDPR and U.K. GDPR also impose strict rules on the transfer of personal data out of the E.E.A and U.K. to U.S. and other Third Countries. Recent legal developments in the E.U. have created further complexity and uncertainty regarding transfers of personal data from the E.E.A and U.K. to the U.S., e.g. on July 16, 2020, the Court of Justice of the European Union, or CJEU, invalidated the EU-U.S. Privacy Shield Framework, or Privacy Shield, under which personal data could be transferred from the E.E.A and U.K. to U.S. entities who had self-certified under the Privacy Shield. While the CJEU upheld the adequacy of the standard contractual clauses (a standard form of contract approved by the European Commission as an adequate personal data transfer mechanism, and potential alternative to the Privacy Shield), it made clear that reliance on those clauses alone may not necessarily be sufficient in all circumstances. Use of the standard contractual clauses must now be assessed on a case-by-case basis taking into account the legal regime applicable in the destination country, in particular applicable surveillance laws and rights of individuals and additional measures and/or contractual provisions may need to be put in place, however, the nature of these additional measures is currently uncertain. Guidance from the European Data Protection Board on what is required by way of additional measures further emphasized the challenges of transferring personal data, in particular unencrypted data, from the E.E.A. A small number of enforcement decisions have also been issued. As supervisory authorities issue further guidance on personal data export mechanisms, including circumstances where the standard contractual clauses can/cannot be used, and/or increase their enforcement activities, we could suffer additional costs, complaints, and/or regulatory scrutiny, investigations or fines, and/or if we are otherwise unable to transfer personal data between and among countries and regions in which we operate, it could affect the manner in which we provide our services, the geographical location or segregation of our relevant systems and operations, and could adversely affect our financial results and generally increase compliance risk.

On June 28, 2021, the European Commission adopted an ‘adequacy decision’ in respect of the U.K., allowing the unrestricted transfer of personal data  from the E.E.A to the U.K. The adequacy decision is intended to apply for a period of four years; however, the Commission is also tasked with monitoring developments in the U.K. on an ongoing basis; if it considers that the U.K. no longer ensures an essentially equivalent level of data protection, the decision could be suspended or repealed. Additionally, the U.K. adequacy decision could face a legal challenge similar to those brought in respect of the Privacy Shield Framework. Were the adequacy decision to be invalidated or withdrawn, this would likely may necessitate additional compliance costs and  increase our overall risk.

The GDPR also provides that E.E.A. member states may make their own further laws and regulations to introduce specific requirements related to the processing of: “special categories of personal data”, including personal data related to health, biometric data used for unique identification purposes and genetic information; as well as personal data related to criminal offences or convictions — for example, in the U.K., the Data Protection Act 2018 complements the GDPR in this regard in the U.K. This fact may lead to greater divergence on the law that applies to the processing of such data types across the E.E.A. and U.K., compliance with which as and where applicable may increase our costs and could increase our overall risk.

Now that the transitional period for the U.K.’s exit from the E.U. has expired, there is increasing scope for divergence in application, interpretation and enforcement of the data protection law between the U.K. and E.U.  On September 10, 2021, the U.K. Government published its proposed reforms to the U.K.’s data protection regime, including changes to the rules on using personal data for research purposes and data transfers. Although a number of these changes are specifically intended to make it easier for business, any changes relating to the U.K. and E.U. position regarding aspects of data protection law may lead to additional compliance costs and could increase our overall risk.

These laws and regulations are increasing in complexity and number, and new regulatory guidance and case law means the regulatory landscape changes frequently. Complying with these numerous, complex and often changing regulations is expensive and difficult. Failure by us, any partners, our service providers, or our employees or contractors to comply with the GDPR could result in regulatory investigations, enforcement notices and/or fines of up to the higher of €20 million or up to 4% of our total worldwide annual turnover. Further, following the withdrawal of the U.K. from the E.U. , we now have to comply with the GDPR and U.K. GDPR separately, each regime separately having the ability to fine up to the higher of €20 million / £17.5 million or 4% of global turnover. Numerous multi-million € / £ fines have been issued by supervisory authorities across the E.E.A. and by the U.K. Information Commissioner’s Office. In addition to administrative fines, a wide

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variety of other potential enforcement powers are available to competent authorities in respect of potential and suspected violations of the GDPR, including extensive audit and inspection rights, and powers to order temporary or permanent bans on all or some processing of personal data carried out by non-compliant actors.

In addition to the foregoing, a breach of privacy laws or data security laws, particularly those resulting in a significant security incident or breach involving the misappropriation, loss or other unauthorized use or disclosure of sensitive or confidential patient or consumer information, could have a material adverse effect on our business, reputation and financial condition. In addition, widely publicized security breaches are increasingly being followed in the E.U. by large ‘class action’ style claims. Although these have yet to succeed in any significant compensation orders, defending these claims is costly and could still result in  substantial liability for compensation and legal fees. As a data controller, we are accountable for any third-party service providers we engage to process personal data on our behalf, including our CROs. We attempt to mitigate the associated risks by performing security assessments and due diligence of our vendors and requiring all such third-party providers with data access to sign agreements, and obligating them to only process data according to our instructions and to take sufficient security measures to protect such data. There is no assurance that these contractual measures and our own privacy and security-related safeguards will protect us from the risks associated with the third-party processing, storage and transmission of such information. Any violation of data or security laws by our third-party processors could have a material adverse effect on our business and result in the fines, penalties and/or other enforcement actions outlined above.

We strive to comply with all applicable laws, but they may conflict with each other, and by complying with the laws or regulations of one jurisdiction, we may find that we are violating the laws or regulations of another jurisdiction. Despite our efforts, we may not have fully complied in the past and may not in the future. If we become liable under laws or regulations applicable to us, we could be required to pay significant fines and penalties (including those described above), our reputation may be harmed and we may be forced to change the way we operate. That could require us to incur significant expenses or to discontinue certain services, which could negatively affect our business.

Due to our limited resources and access to capital, we must, and have in the past decided to, prioritize development of certain ProTide candidates over other potential candidates. These decisions may prove to have been wrong and may adversely affect our performance.

Because we have limited resources and access to capital to fund our operations, we must decide which ProTides to pursue and the resources to allocate to each. Our decisions concerning the allocation of research, collaboration, management and financial resources toward particular ProTides or therapeutic areas may not lead to the development of viable commercial products and may divert resources away from better opportunities. Similarly, our decisions to delay, terminate or collaborate with third parties in respect of product development programs may also prove not to be optimal and could cause us to miss valuable opportunities. If we make incorrect determinations regarding the market potential of our ProTides or misread trends in the biopharmaceutical industry, in particular for our lead ProTides, then our business may be adversely affected.

We may not be successful in our efforts to use and expand our technology platform to build a pipeline of additional ProTide candidates.

A key element of our strategy is to use and expand our proprietary ProTide technology to build a pipeline of additional ProTide candidates and progress these ProTide candidates through clinical development for the treatment of cancer. Although our research and development efforts to date have resulted in a pipeline of ProTide candidates directed at the treatment of many solid tumors and hematological malignancies, we may not be able to develop ProTide candidates that are safe and effective. Even if we are successful in continuing to build our pipeline, the potential product candidates that we identify may not be suitable for clinical development, including as a result of being shown to have harmful side effects or other characteristics that indicate that they are unlikely to be products that will receive marketing approval and achieve market acceptance.

Risks Related to Marketing Approval of Our Product Candidates

If we are not able to obtain, or if there are delays in obtaining, required marketing approvals, we will not be able to commercialize our product candidates and our ability to generate revenue will be impaired.

Our product candidates and the activities associated with their development and commercialization, including their design, testing, manufacture, safety, efficacy, recordkeeping, labeling, storage, approval, advertising, promotion, sale, distribution, import and export are subject to comprehensive regulation by the FDA and other regulatory agencies in the United States and by comparable authorities in other countries.

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These requirements include submissions of safety and other post-marketing information and reports, registration and listing requirements, current good manufacturing practice, or cGMP, requirements relating to manufacturing, quality control, quality assurance and corresponding maintenance of records and documents, including periodic inspections by FDA and other regulatory authorities, requirements regarding the distribution of samples to physicians and recordkeeping. Before we can commercialize any of our product candidates, each such product candidate must be approved by the FDA pursuant to an NDA in the United States, by the EMA pursuant to an MAA in the European Union, and by similar regulatory authorities outside the United States prior to commercialization.

The process of obtaining marketing approvals, both in the United States and abroad, is expensive and takes several years, if approval is obtained at all, and can vary substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product candidate. We have not received approval to market any of our product candidates from regulatory authorities in any jurisdiction. We have limited experience in planning and conducting the clinical trials required for marketing approvals, and we expect to rely on third-party contract research organizations, or CROs, to assist us in this process. Obtaining marketing approval requires the submission of extensive preclinical and clinical data and supporting information to regulatory authorities for each therapeutic indication to establish the product candidate’s safety and efficacy. Securing marketing approval also requires the submission of information about the product manufacturing process, and in many cases the inspection of manufacturing facilities by the regulatory authorities. Our product candidates may not be effective, may be only moderately effective or may prove to have undesirable or unintended side effects, toxicities or other characteristics that may preclude our obtaining marketing approval or prevent or limit commercial use. Because a number of our clinical trials will be in combination with other approved therapies, there may also be undesirable or unintended side effects, toxicities or other characteristics resulting from the other therapy or from its combination with our product candidate. In addition, because our product candidates are transformations of nucleoside analogs, including those that are approved chemotherapeutic agents and those that have never been approved as chemotherapeutic agents, our product candidates could be negatively impacted by the identification of any new undesirable or unintended side effects, toxicities or other characteristics in such existing nucleoside analogs, in particular in those that have never been approved as chemotherapeutic agents.

Regulatory authorities have substantial discretion in the new drug approval process and may refuse to accept any application or may decide that our data are insufficient for approval and require additional preclinical studies or clinical trials. Our product candidates could be delayed in receiving, or fail to receive, marketing approval for many reasons, including the following:

 

the FDA or comparable foreign regulatory authorities may disagree with the design or implementation of our clinical trials or require that we perform additional clinical trials, including toxicology trials;

 

we may be unable to demonstrate to the satisfaction of the FDA or comparable foreign regulatory authorities that a product candidate is safe and effective for its proposed indication;

 

the results of our clinical trials may not meet the level of statistical significance required by the FDA or comparable foreign regulatory authorities for marketing approval;

 

we may be unable to demonstrate that a product candidate’s clinical and other benefits outweigh its safety risks;

 

the FDA or comparable foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical trials;

 

the data collected from clinical trials of our product candidates may not be sufficient to support the submission of an NDA or other submission to obtain marketing approval in the United States or elsewhere;

 

third-party manufacturers or our clinical or commercial product candidates may be unable to meet the FDA’s cGMP requirements or similar requirements of foreign regulatory authorities; and

 

the approval requirements or policies of the FDA or comparable foreign regulatory authorities may significantly change in a manner rendering our clinical data insufficient for approval.

In addition, even if we were to obtain approval, regulatory authorities may approve our product candidates for fewer or more limited indications than we request, may grant approval contingent on the performance of costly post-marketing clinical trials, may approve a product candidate with restrictions on distribution or other REMS elements, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. Any of the foregoing scenarios could harm the commercial prospects for our product candidates.

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If we experience delays in obtaining approval or if we fail to obtain approval of our product candidates, the commercial prospects for our product candidates may be harmed and our ability to generate revenues will be impaired.

Our product candidates may cause undesirable side effects that could delay or prevent their marketing approval, limit the commercial profile of an approved label, or result in significant negative consequences following marketing approval, if any.

Undesirable side effects caused by our product candidates could cause us or the FDA or other regulatory authorities to interrupt, delay or halt our clinical trials and could result in more restrictive labels or the delay or denial of marketing approval by the FDA or other regulatory authorities of our product candidates. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of these or other side effects. In such an event, our trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to cease further development of or deny approval of our product candidates for any or all targeted indications. The drug-related side effects could also affect patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims.

Further, clinical trials by their nature utilize a sample of the potential patient population. With a limited number of patients, rare and severe side effects of our product candidates may only be uncovered with a significantly larger number of patients exposed to the product candidate. If our product candidates receive marketing approval and we or others identify undesirable side effects caused by such product candidates or any other similar drugs after such approval, a number of potentially significant negative consequences could result, including:

 

regulatory authorities may withdraw or limit their approval of such product candidates;

 

regulatory authorities may require the addition of labeling statements, such as a “boxed” warning or a contraindication;

 

we may be required to create a medication guide outlining the risks of such side effects for distribution to patients;

 

we may be required to change the way such product candidates are distributed or administered, conduct additional clinical trials or change the labeling of the product candidates;

 

regulatory authorities may require a REMS plan to mitigate risks, which could include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools;

 

we may be subject to regulatory investigations and government enforcement actions;

 

we may decide to remove such product candidates from the marketplace after they are approved;

 

we could be sued and held liable for injury caused to individuals exposed to or taking our product candidates; and

 

our reputation may suffer.

In addition, the patient profile in the indications for which we are currently developing our product candidates, with many patients already seriously ill at the time of initiation of treatment, may result in an increased risk of claims that undesirable side effects or poor prognoses or outcomes are related to our product candidates. Regardless of whether or not such side effects or prognoses or outcomes are ultimately determined to be related to our product candidates, the claims themselves could result in some or all of the foregoing negative consequences.

We believe that any of these events could prevent us from achieving or maintaining market acceptance of the affected product candidates and could substantially increase the costs of commercializing our product candidates, if approved, and significantly impact our ability to successfully commercialize our product candidates and generate revenues.

A Fast Track Designation by the FDA, even if granted for any of our product candidates, may not lead to a faster development or regulatory review or approval process and does not increase the likelihood that our product candidates will receive marketing approval.

If a drug is intended for the treatment of a serious or life-threatening condition and the drug demonstrates the potential to address unmet medical needs for this condition, the drug sponsor may apply for FDA Fast Track Designation. The FDA has broad discretion whether to grant this designation. Even if we believe a particular product candidate is eligible for this designation, we cannot assure you that the FDA would decide to grant it. Even if we do receive Fast Track Designation, we may not experience a faster development process, review or approval compared to conventional FDA procedures. The FDA

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may withdraw Fast Track Designation if it believes that the designation is no longer supported by data from our clinical development program. Many drugs that have received Fast Track Designation have failed to obtain drug approval.

Any product candidate for which we obtain marketing approval will be subject to extensive post-marketing regulatory requirements and could be subject to post-marketing restrictions or withdrawal from the market, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our products, when and if any of them are approved.

If the FDA or a comparable foreign regulatory authority approves any of our product candidates, activities such as the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion and recordkeeping for the product will be subject to extensive and ongoing regulatory requirements. The FDA or a comparable foreign regulatory authority may also impose requirements for costly post-marketing preclinical studies or clinical trials and surveillance programs to monitor the safety or efficacy of the product. The FDA closely regulates the post-approval marketing and promotion of drugs to ensure drugs are marketed only for the approved indications and in accordance with the provisions of the approved labeling. The FDA imposes stringent restrictions on manufacturers’ communications regarding use of their products, and if we promote our products beyond their approved indications or in a way that is inconsistent with the FDA-approved labeling, we may be subject to enforcement actions or prosecution arising from that off-label promotion. Violations of the Federal Food, Drug, and Cosmetic Act relating to the promotion of prescription drugs may also lead to investigations alleging violations of federal and state healthcare fraud and abuse and other laws, as well as state consumer protection laws.

Drug manufacturers and manufacturers’ facilities are also required to continuously comply with FDA and comparable foreign regulatory authority requirements, including ensuring that quality control and manufacturing procedures conform to cGMP regulations and corresponding foreign regulatory manufacturing requirements. As such, we and our third-party suppliers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any NDA or other marketing authorization application.

In addition, later discovery of previously unknown adverse events or other problems with our products, manufacturers or manufacturing processes, or failure to comply with regulatory requirements, may yield various results, including:

 

restrictions on such products, manufacturers or manufacturing processes;

 

restrictions on the labeling or marketing of a product;

 

restrictions on product distribution or use;

 

requirements to conduct post-marketing studies or clinical trials;

 

warning or untitled letters;

 

withdrawal of the products from the market;

 

refusal to approve pending applications or supplements to approved applications that we submit;

 

recall of products;

 

fines, restitution or disgorgement of profits or revenues;

 

suspension or withdrawal of marketing approvals;

 

refusal to permit the import or export of our products;

 

product seizure; or

 

injunctions or the imposition of civil or criminal penalties.

Non-compliance with European Union requirements regarding safety monitoring or pharmacovigilance can also result in significant financial penalties. Similarly, failure to comply with the European Union’s requirements regarding the protection of personal information can also lead to significant penalties and sanctions.

The FDA’s or other regulatory authorities’ policies may change and additional government regulations may be enacted that could prevent, limit or delay marketing approval of our product candidates. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained.

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Our relationships with customers and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future earnings.

Although we do not currently have any drugs on the market, once we begin commercializing our product candidates, we will be subject to additional healthcare statutory and regulatory requirements and enforcement by the U.S. federal and state governments and the foreign governments in the jurisdictions in which we conduct our business. Healthcare providers, physicians and third-party payors will play a primary role in the recommendation and prescription of any product candidates for which we obtain marketing approval. Our future arrangements with third-party payors and customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market, sell and distribute any products for which we obtain marketing approval. Restrictions under applicable U.S. federal and state healthcare laws and regulations include the following:

 

the federal Anti-Kickback Statute prohibits, among other things, persons from knowingly and willfully soliciting, offering, receiving or paying remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, either the referral of an individual for, or the purchase, order or recommendation of, any good or service for which payment may be made under a federal healthcare program such as Medicare and Medicaid; a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation;

 

the federal false claims laws, including, without limitation, the civil False Claims Act (which can be enforced by private citizens through qui tam actions), impose criminal and civil penalties against individuals or entities for knowingly presenting, or causing to be presented, to the federal government, claims for payment that are false or fraudulent or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal government; in addition, the government may assert that a claim including items and services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act;

 

the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, imposes criminal and civil liability for executing a scheme to defraud any healthcare benefit program, or knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false statement in connection with the delivery of or payment for healthcare benefits, items or services; similar to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation;

 

the federal physician payment transparency requirements under the Physician Payments Sunshine Act, enacted as part of the ACA, require manufacturers of drugs, devices, biologics and medical supplies that are reimbursable under Medicare, Medicaid, or the Children’s Health Insurance Program to report to the Centers for Medicare & Medicaid Services, or CMS, information related to payments and other transfers of value to physicians and teaching hospitals, and certain advanced non-physician health care practitioners and the ownership and investment interests of physicians and their immediate family members in such manufacturers;

 

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act and its implementing regulations, which also imposes obligations on certain covered entity healthcare providers, health plans, and healthcare clearinghouses as well as their business associates that perform certain services involving the use or disclosure of individually identifiable health information, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;

 

some state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures; and

 

state and foreign laws that govern the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.

Analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers.

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Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, disgorgement, imprisonment, exclusion of our products from government funded healthcare programs, such as Medicare and Medicaid, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, reputational harm, and the curtailment or restructuring of our operations. In addition, if any of the physicians or other healthcare providers or entities with whom we expect to do business are found to be not in compliance with applicable laws, they may be subject to significant criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.

Current and future legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our product candidates and affect the prices we may obtain.

In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability to profitably sell any product candidates for which we obtain marketing approval. For example, in August 2017, the FDA Reauthorization Act was signed into law, which reauthorized the FDA’s user fee programs and included additional drug and device provisions. Furthermore, the next FDA reauthorization package is currently being negotiated and is required to be finalized by Congress in mid-2022. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we otherwise may have obtained and we may not achieve or sustain profitability, which would adversely affect our business, prospects, financial condition and results of operations.

In addition, there have been and continue to be a number of initiatives at the U.S. federal and state levels that seek to reduce healthcare costs and improve the quality of healthcare. For example, in March 2010, the ACA was enacted in the United States, substantially changing the way healthcare is financed by both governmental and private insurers and significantly affecting the pharmaceutical industry. The ACA contained a number of provisions, including those governing enrollment in federal healthcare programs, reimbursement adjustments and changes to fraud and abuse laws. As another example, the 2021 Consolidated Appropriations Act signed into law on December 27, 2020 incorporated extensive health care provisions and amendments to existing laws, including a requirement that all manufacturers of drugs products covered under Medicare Part B report the product’s average sales price to the federal.

There have been executive, judicial and Congressional challenges to certain aspects of the ACA since its enactment. On June 17, 2021, the U.S. Supreme Court dismissed on procedural grounds a cha