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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 11, 2025

LIXTE BIOTECHNOLOGY HOLDINGS, INC.

delaware |  | 001-39717 |  | 20-2903526
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (IRS Employer Identification No.)

680 East Colorado Boulevard, Suite 180

Pasadena, California 91101

(Address of principal executive offices)

(631) 830-7092

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (See General Instruction A.2. below):

☐ | Written communications pursuant to Rule 425 under the Securities Act of 1933 (17 CFR 230.425)
☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ | Pre-commencement communications pursuant to Rule 13e-4(e) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock, par value $0.0001 per share |  | LIXT |  | The Nasdaq Stock Market LLC
Warrants to Purchase Common Stock, par value $0.0001 per share |  | LIXTW |  | The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, 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. ☐

Item 1.01 Entry into a Material Definitive Agreement.

Reference is made to the Current Report on Form 8-K of Lixte Biotechnology Holdings, Inc. (the “Company”) filed with the Securities and Exchange Commission on August 6, 2019 relating to the Collaboration Agreement For An Investigator-Initiated Clinical Trial (the “Clinical Trial Agreement”) between the Company and Grupo Español de Investigación en Sarcomas (“GEIS”) effective July 31, 2019.

The Clinical Trial Agreement set forth the terms under which GEIS would conduct a clinical research protocol to study the safety and/or efficacy of LB-100, the Company’s lead compound (the “Study”). The Clinical Trial Agreement was intended to support a Phase 1b/randomized Phase 2 Study of doxorubicin, the global standard for initial treatment of advanced soft tissue sarcomas versus doxorubicin plus LB-100. The Company had agreed to provide funding for the Study. The Clinical Trial Agreement was filed as Exhibit 10.1 to the previously referenced Current Report on Form 8-K.

This Study commenced during the quarter ended June 30, 2023 and is expected to be completed and a report prepared by December 31, 2026. The recruitment for the Phase 1b portion of the Study was completed during the quarter ended September 30, 2024, and the Company expects to have initial data on toxicity and preliminary efficacy from this portion of the Study during the quarter ending December 31, 2025.

Effective March 11, 2025, the Company and GEIS entered into Amendment No. 1 to the Clinical Trial Agreement that relieved the Company of the financial obligation to support the randomized Phase 2 portion of this Study contemplated in the Clinical Trial Agreement of approximately $3,095,000. Amendment No. 1 to the Clinical Trial Agreement is filed as Exhibit 10.1 to this Current Report on Form 8-K (the “Report”) and is incorporated herein by reference. The description of Amendment No. 1 to the Clinical Trial Agreement is qualified in its entirety by reference to Exhibit 10.1 to the Report..

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

The Company is filing as part of this Report the exhibits listed on the accompanying Index to Exhibits, which information is incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| LIXTE BIOTECHNOLOGY HOLDINGS, INC.
| (Registrant)
Date: March 14, 2025 | By: | /s/ BASTIAAN VAN DER BAAN
|  | Bastiaan van der Baan President and Chief Executive Officer

INDEX TO EXHIBITS

Exhibit No. |  | Description
10.1 |  | Amendment No. 1 to the Clinical Trial Agreement between the Company and GEIS dated March 11, 2025
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL Document)