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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

March 25, 2025

Date of Report (Date of earliest event reported)

Aprea Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

Delaware

001-39069

84-2246769

(State or other jurisdiction
of incorporation)

(Commission
File Number)

(IRS Employer
Identification No.)

    

3805 Old Easton Road
Doylestown, PA
(Address of principal executive offices)

18902
(Zip Code)

Registrant’s telephone number, including area code: (215) 948-4119

(Former name or former address, if changed since last report): Not applicable

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:

Written communications pursuant to Rule 425 under the Securities Act (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(c) 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 $0.001 per share

APRE

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 2.02Results of Operations and Financial Condition.

On March 25, 2025, Aprea Therapeutics, Inc. (the “Company”) issued a press release announcing its financial results for the three and twelve months ended December 31, 2024, and provided an update on the Company’s operations for the same period. The Company is furnishing a copy of the press release, which is attached hereto as Exhibit 99.1.

In accordance with General Instruction B.2 of Form 8-K, the information included in this Item 2.02, including Exhibit 99.1 hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing made by the Company under the Exchange Act or Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

Item 5.02Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Effective March 25, 2025, the Company entered into an amendment (the “Amendment”) to the Employment Agreement dated as of January 30, 2023, by and between the Company and John P. Hamill (the “Employment Agreement”). Pursuant to the Amendment, the Employment Agreement was amended to provide that in the event Mr. Hamill is terminated by the Company without “cause” or if Mr. Hamill terminates his employment for “good reason,” Mr. Hamill will be entitled to receive, upon execution and effectiveness of a release of claims, (i) continued payment of his then-current base salary for a period of 12 months, instead of 9 months, following termination, and (ii) a direct payment by the Company of the medical, vision and dental coverage premiums due to maintain any COBRA coverage for which Mr. Hamill and his dependents are eligible and for which Mr. Hamill has appropriately elected through the earlier of (x) 12 months, instead of 9 months, following termination and (y) the date Mr. Hamill becomes employed by another entity or individual; provided, that, upon a termination without “cause” or due to “good reason,” during the 12-month period following a “change of control,” Mr. Hamill will be entitled to 18 months of continued base salary and reimbursement for COBRA coverage premiums rather than 12 months.

The foregoing description of the Amendment is qualified in its entirety by reference to the full text of the Amendment, a copy of which will be filed with the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024.

Item 8.01Other Events.

On March 25, 2025, the Company updated its corporate presentation slide deck. A copy of the corporate presentation slide deck is filed as Exhibit 99.2 hereto and incorporated herein by reference.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits.

Exhibit
Number

    

Description

99.1

Press release issued by Aprea Therapeutics, Inc. dated March 25, 2025.

99.2

Corporate Presentation (March 2025).

104

Cover Page Interactive Data File (embedded within the inline XBRL document).

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.

Aprea Therapeutics, Inc.

Dated: March 25, 2025

By:

/s/ Oren Gilad

Name:

Oren Gilad, Ph.D.

Title:

President and Chief Executive Officer

EX-99.1 2 apre-20250325xex99d1.htm EX-99.1

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Exhibit 99.1

Aprea Therapeutics Reports Fourth Quarter and Full Year 2024 Financial Results and Provides a Business Update

ACESOT-1051 trial evaluating WEE1 kinase inhibitor APR-1051 now enrolling patients in Cohort 5; open label safety and efficacy data expected H2 2025

Twice daily (BID) dosing regimen in ongoing ABOYA-119 trial expected to maximize clinical benefit of ATR inhibitor ATRN-119; plan to complete dose escalation H2 2025

$22.8 million in cash and cash equivalents as of December 31, 2024

DOYLESTOWN, PA, Mar. 25, 2025 (GLOBE NEWSWIRE) – Aprea Therapeutics, Inc. (Nasdaq: APRE) (“Aprea”, or the “Company”), a clinical-stage biopharmaceutical company developing innovative treatments that exploit specific cancer cell vulnerabilities while minimizing damage to healthy cells, today reported financial results for the fourth quarter and full year ended December 31, 2024, and provided a business update.

“We made excellent progress across our pipeline in 2024, laying a strong foundation for the year ahead,” said Oren Gilad, Ph.D., President and Chief Executive Officer of Aprea. “We continue to enroll patients in the ACESOT-1051 trial evaluating our WEE1 kinase inhibitor, APR-1051, which we believe has best in class potential. The compound appears safe and well tolerated to date with no hematologic toxicity. We look forward to reporting open label data from ACESOT-1051 in the second half of the year. We are also advancing ATRN-119, our highly selective first-in-class macrocyclic ATR inhibitor. The ongoing ABOYA-119 trial is now evaluating ATRN-119 as continuous once daily and twice daily monotherapy in order to maximize therapeutic benefit. Our ultimate goal is to transform the treatment paradigm for difficult to treat cancers by unlocking the full potential of DDR-based therapies.”

Key Business Updates and Potential Upcoming Key Milestones

ACESOT-1051: A Biomarkers Focused, Phase 1 Trial of Oral WEE1 inhibitor, APR-1051

APR-1051 is a potent and selective small molecule that has been designed to potentially solve tolerability challenges of the WEE1 class and may achieve greater clinical activity than other programs currently in development. Aprea is advancing APR-1051 as monotherapy in cancers with Cyclin E over-expression, as well as other biomarkers that may predict sensitivity to WEE1 inhibition. Cancers over-expressing Cyclin E represent a high unmet medical need. Patients with Cyclin E over-expression have poor prognosis and, currently, have no effective therapies available.
Patients are now being enrolled in Cohort 5 (70 mg dose) of the ACESOT-1051 (A Multi-Center Evaluation of WEE1 Inhibitor in Patients with Advanced Solid Tumors, APR-1051) trial. This Phase 1 clinical trial is evaluating single-agent APR-1051 in advanced solid tumors harboring cancer-associated gene alterations. No hematological toxicities have been observed to date. The primary objectives of the Phase 1 study are to measure safety, dose-limiting toxicities (DLTs), maximum tolerated dose or maximum administered dose (MTD/MAD), and recommended Phase 2 dose (RP2D); secondary objectives are to evaluate pharmacokinetics and preliminary efficacy according to RECIST or PCWG3 criteria; pharmacodynamic parameters are exploratory objectives.

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In October 2024, preliminary findings from the ACESOT-1051 trial were reported in a poster at the EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics, in Barcelona, Spain. The poster can be viewed on Aprea’s corporate website here.
Preliminary efficacy data from ACESOT-1051 are expected in the second half of 2025. For more information, refer to ClinicalTrials.gov NCT06260514.

ABOYA-119: Ongoing Clinical Trial Evaluating ATR inhibitor, ATRN-119

ATRN-119 is a potent and highly selective first-in-class macrocyclic ATR inhibitor, designed to be used in patients with mutations in DDR-related genes. Cancers with mutations in DDR-related genes represent a high unmet medical need. Patients with DDR-related gene mutations have a poor prognosis and, currently, there are no effective therapies available for them.
ATRN-119 is being evaluated in the open-label Phase 1/2a clinical trial of ABOYA-119 as monotherapy in patients with advanced solid tumors having at least one mutation in a defined panel of DDR-related genes. Patients are currently being enrolled at Dose Level 7, with both 1100 mg once daily and 550 mg twice daily doses being evaluated independently and in parallel. The addition of twice daily dosing was implemented to potentially optimize ATRN-119’s activity across a 24-hour cycle thereby providing better target coverage and maximal clinical benefit. This is expected to increase the likelihood of achieving superior clinical outcomes and may potentially accelerate the path to regulatory approval and commercialization. 
An update from the ABOYA-119 trial was provided in a poster at the EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics in October, 2024. A copy of the poster can be viewed here.
For more information on ABOYA-119, please refer to clinicaltrials.gov NCT04905914. 

Corporate

Aprea engaged Philippe Pultar, MD in October 2024 as senior medical advisor to support the development and advancement of APR-1051. Dr. Pultar is a seasoned pharmaceutical executive with extensive experience in oncology. He was most recently employed at Zentalis Pharmaceuticals where he played a key role in the strategy and execution of the global clinical development of azenosertib, a WEE1 inhibitor.

Select Financial Results for the Fourth Quarter ended December 31, 2024

For the quarter ended December 31, 2024, the Company reported an operating loss of $3.2 million, compared to an operating loss of $3.7 million in the fourth quarter of 2023.
Research and Development (R&D) expenses were $2.4 million for the quarter ended December 31, 2024, compared to $2.0 million for the fourth quarter of 2023. The increase in R&D expense was primarily related to an increase in personnel costs primarily related to new hires and severance.
General and Administrative (G&A) expenses were $1.1 million for the quarter ended December 31, 2024, compared to $1.6 million for the comparable period in 2023.
The Company reported a net loss of $2.9 million ($0.49 per basic share) on approximately 6.0 million weighted-average common shares outstanding for the quarter ended December 31, 2024, compared to a net loss of $3.4 million ($0.92 per basic share) on approximately 3.7 million weighted average common shares outstanding for the comparable period in 2023.

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Select Financial Results for the Year ended December 31, 2024

As of December 31, 2024, the Company reported cash and cash equivalents of $22.8 million compared to $21.6 million as of December 31, 2023. The Company believes its cash and cash equivalents as of December 31, 2024 will be sufficient to meet its currently projected operating expenses and capital expenditure requirements into the first quarter of 2026.
For the year ended December 31, 2024, the Company reported an operating loss of $14.3 million, compared to an operating loss of $15.5 million for the year ended December 31, 2023.
R&D expenses were $9.4 million for the year ended December 31, 2024, compared to $7.6 million for the year ended December 31, 2023. The increase in R&D expense was primarily related to the ABOYA-119 clinical trial to evaluate ATRN-119, the initiation of the ACESOT-1051 clinical trial to evaluate APR-1051 and an increase in personnel costs primarily related to new hires and severance.
G&A expenses were $6.5 million for the year ended December 31, 2024, compared to $8.4 million for the year ended December 31, 2023. The decrease in G&A expenses was primarily due to a decrease in personnel costs primarily related to severance expense for former executives and insurance premiums.
The Company reported a net loss of $13.0 million ($2.35 per basic share) on approximately 5.5 million weighted-average common shares outstanding for the year ended December 31, 2024, compared to a net loss of $14.3 million ($3.95 per basic share) on approximately 3.6 million weighted average common shares outstanding for the comparable period in 2023.

About Aprea

Aprea is pioneering a new approach to treat cancer by exploiting vulnerabilities associated with cancer cell mutations. This approach was developed to kill tumors but to minimize the effect on normal, healthy cells, decreasing the risk of toxicity that is frequently associated with chemotherapy and other treatments. Aprea’s technology has potential applications across multiple cancer types, enabling it to target a range of tumors, including ovarian, colorectal, prostate, and breast cancers. The company’s lead programs are APR-1051, an oral, small-molecule inhibitor of WEE1 kinase, and ATRN-119, a small molecule ATR inhibitor, both in clinical development for solid tumor indications. For more information, please visit the company website at www.aprea.com.

The Company may use, and intends to use, its investor relations website at https://ir.aprea.com/ as a means of disclosing material nonpublic information and for complying with its disclosure obligations under Regulation FD.

Forward-Looking Statement
Certain information contained in this press release includes “forward-looking statements”, within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended related to our study analyses, clinical trials, regulatory submissions, and projected cash position. We may, in some cases use terms such as “future,” “predicts,” “believes,” “potential,” “continue,” “anticipates,” “estimates,” “expects,” “plans,” “intends,” “targeting,” “confidence,” “may,” “could,” “might,” “likely,” “will,” “should” or other words that convey uncertainty of the future events or outcomes to identify these forward-looking statements. Our forward-looking statements are based on current beliefs and expectations of our management team and on information currently available to management that involve risks, potential changes in circumstances, assumptions, and uncertainties. All statements contained in this press release other than statements of historical fact are forward-looking statements, including statements regarding our ability to develop, commercialize, and achieve market acceptance of our current and planned products and services, our research and development efforts, including timing considerations and other matters regarding our business strategies, use of capital, results of operations and financial


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position, and plans and objectives for future operations. Any or all of the forward-looking statements may turn out to be wrong or be affected by inaccurate assumptions we might make or by known or unknown risks and uncertainties. These forward-looking statements are subject to risks and uncertainties including, without limitation, risks related to the success, timing, and cost of our ongoing clinical trials and anticipated clinical trials for our current product candidates, including statements regarding the timing of initiation, pace of enrollment and completion of the trials (including our ability to fully fund our disclosed clinical trials, which assumes no material changes to our currently projected expenses), futility analyses, presentations at conferences and data reported in an abstract, and receipt of interim or preliminary results (including, without limitation, any preclinical results or data), which are not necessarily indicative of the final results of our ongoing clinical trials, our understanding of product candidates mechanisms of action and interpretation of preclinical and early clinical results from its clinical development programs, our ability to continue as a going concern, and the other risks, uncertainties, and other factors described under “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in the documents we file with the U.S. Securities and Exchange Commission. For all these reasons, actual results and developments could be materially different from those expressed in or implied by our forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, which are made only as of the date of this press release. We undertake no obligation to update such forward-looking statements for any reason, except as required by law.

Investor Contact:

Mike Moyer

LifeSci Advisors

mmoyer@lifesciadvisors.com


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Aprea Therapeutics, Inc.

Consolidated Balance Sheets

December 31, 

December 31, 

    

2024

    

2023

Assets

 

  

 

  

Current assets:

 

  

 

  

Cash and cash equivalents

$

22,849,885

$

21,606,820

Prepaid expenses and other current assets

 

726,254

 

914,275

Total current assets

 

23,576,139

 

22,521,095

Property and equipment, net

 

81,522

 

88,362

Restricted cash

 

40,170

 

40,717

Other noncurrent assets

 

281,662

 

Total assets

$

23,979,493

$

22,650,174

Liabilities and Stockholders’ Equity

 

  

 

  

Current liabilities:

 

  

 

  

Accounts payable

$

1,352,240

$

1,670,369

Accrued expenses

 

2,008,735

 

2,186,262

Deferred revenue

 

 

528,974

Total current liabilities

 

3,360,975

 

4,385,605

Commitments and contingencies

 

  

 

  

Series A convertible preferred stock, $0.001 par value, 40,000,000 shares authorized; 56,227 shares issued and outstanding at December 31, 2024 and December 31, 2023, respectively.

 

1,311,063

 

1,311,063

Stockholders’ equity:

 

  

 

  

Common stock, $0.001 par value, 400,000,000 shares authorized, 5,481,055 and 3,736,673 shares issued and outstanding at December 31, 2024 and December 31, 2023, respectively.

 

5,481

 

3,736

Additional paid-in capital

 

350,971,225

 

335,644,204

Accumulated other comprehensive loss

 

(10,627,379)

 

(10,611,273)

Accumulated deficit

 

(321,041,872)

 

(308,083,161)

Total stockholders’ equity

 

19,307,455

 

16,953,506

Total liabilities and stockholders' equity

$

23,979,493

$

22,650,174


Graphic

Aprea Therapeutics, Inc.

Consolidated Statements of Operations and Comprehensive Loss

Three Months Ended December 31, 

Year Ended December 31,

    

2024

    

2023

 

2024

    

2023

(Unaudited)

Grant revenue

 

$

205,817

$

14,075

 

1,502,581

$

583,231

Operating expenses:

 

  

 

  

Research and development

2,359,086

2,045,689

$

9,363,537

$

7,627,491

General and administrative

 

1,072,776

1,643,315

 

6,458,699

$

8,427,703

Total operating expenses

 

3,431,862

 

3,689,004

 

15,822,236

 

16,055,194

Loss from operations

 

(3,226,045)

 

(3,674,929)

 

(14,319,655)

 

(15,471,963)

Other income (expense):

 

 

 

 

Interest income, net

 

274,626

310,287

 

1,289,144

$

1,224,133

Foreign currency gain (loss)

 

56,620

 

(78,612)

 

71,800

$

(38,926)

Total other income

 

331,246

 

231,675

 

1,360,944

 

1,185,207

Net loss

$

(2,894,799)

$

(3,443,254)

$

(12,958,711)

$

(14,286,756)

Other comprehensive (loss) income :

 

 

 

 

Foreign currency translation

 

(22,632)

 

24,601

 

(16,106)

$

12,135

Total comprehensive loss

 

(2,917,431)

 

(3,418,653)

$

(12,974,817)

$

(14,274,621)

Net loss per share attributable to common stockholders, basic and diluted

$

(0.49)

$

(0.92)

$

(2.35)

$

(3.95)

Weighted-average common shares outstanding, basic and diluted

 

5,954,700

 

3,736,673

 

5,509,921

$

3,617,607


EX-99.2 3 apre-20250325xex99d2.htm EX-99.2
Exhibit 99.2

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Precision Oncology Through Synthetic Lethality March 2025


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2 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Forward-Looking Statements Certain information contained in this presentation includes “forward-looking statements”, within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, related to our clinical trials, regulatory submissions and strategic plans. We may, in some cases use terms such as “predicts,” “believes,” “potential,” “continue,” “anticipates,” “estimates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “likely,” “will,” “should” or other words that convey uncertainty of the future events or outcomes to identify these forward-looking statements. The forward-looking statements are based on current beliefs and expectations of our management team that involve risks, potential changes in circumstances, assumptions, and uncertainties. Any or all of the forward-looking statements may turn out to be wrong or be affected by inaccurate assumptions our management team might make or by known or unknown risks and uncertainties. These forward-looking statements are subject to risks and uncertainties including, without limitation, risks related to the success and timing of our clinical trials or other studies and the other risks set forth in our filings with the U.S. Securities and Exchange Commission, including our Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q. Forward-looking statements regarding our product candidates are also subject to additional risks and uncertainties, including without limitation, with respect to: our dependence on additional financing to fund our operations and complete the development and commercialization of our product candidates, and the risks that raising such additional capital may restrict our operations or require us to relinquish rights to our technologies or product candidates; our business plan or the likelihood of the successful implementation of such business plan; the timing of our clinical trials for our product candidates; the future success of such trials; the successful implementation of our research and development programs and collaborations and the interpretation of the results and findings of such programs and collaborations and whether such results are sufficient to support the future success of our product candidates; the success, timing and cost of our clinical trials for our current product candidates; the timing of initiation, futility analyses, data presentation, reporting and publication and receipt of interim results (including, without limitation, any preclinical results or data); any statements about our understanding of product candidates mechanisms of action and interpretation of preclinical and early clinical results from its clinical development programs and any collaboration studies; and other factors, including legislative, regulatory, political and economic developments not within our control. For all these reasons, actual results and developments could be materially different from those expressed in or implied by our forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, which are made only as of the date of this presentation. We undertake no obligation to update such forward-looking statements to reflect subsequent events or circumstances, except to the extent required by law or regulation.


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3 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Aprea Therapeutics (NASDAQ: APRE) All programs are designed to address significant unmet medical need, are potentially synergistic with other anticancer therapies, and potentially differentiated in safety and tolerability ATR – Ataxia telangiectasia and Rad3‐related DDR – DNA Damage Response BID – Twice Daily Precision Oncology via Novel Synthetic Lethality Therapeutics • Macrocyclic inhibitor • Bio informatic analysis performed in house • Declared first generation lead molecule • Advance preclinical development by YE 2025 WEE1 Inhibitor: APR-1051 ATR Inhibitor: ATRN-119 DDR Inhibitor: Undisclosed • Macrocyclic ATR inhibitor • Pre-clinical proof-of-principle • Highly potent and selective • Minimal off-target effect • Phase 1/2a – ongoing • Continuous daily dosing • Minimal hematologic toxicity observed • BID regimen added • H2 2025 Complete dose escalation • Next generation inhibitor • Pre-clinical proof-of-principle • Highly potent and selective • Minimal off-target effect • Phase 1 study – ongoing • Continuous daily dosing • Promising pharmacokinetics • Minimal hematologic toxicity observed to date • H2 2025 Safety/efficacy data expected • H1 2026 Complete dose escalation


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4 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Robust DDR Development Pipeline Milestones 2024-2026 Accomplished And Anticipated Clinical Milestones 2024 2025 2026 H1 H2 H1 H2 H1 H2 ATR ATRN-119 WEE1 APR-1051 Complete Dose Escalation RP2D Enroll First Patient ACESOT-1051 : Phase 1 – Monotherapy Dose Escalation Enrolled First Patient Complete Dose Escalation Safety/efficacy Data IND Cleared ABOYA-119: Phase 1/2a – Monotherapy Dose Expansion ABOYA-119: Phase 1/2a – Monotherapy Dose Escalation : QD BOIN Design Initiate BID Regimen – Dose Selection Optimization ABOYA-119: Phase 1/2a – Monotherapy Dose Escalation : BID


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5 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Synthetic Lethality • Cancer cell death only upon the loss of function of two codependent pathways • DNA Damage Response (DDR) allows cells to pause and self repair during replication (mitosis) overcoming affected pathway • Inhibition of DDR leads to mitotic catastrophe and cell death • ATR and WEE1 inhibitors are integral to stopping DDR and are emerging targets for cancer cell death • Builds on scientific innovation led by Aprea founder and key personnel1 1 Gilad et al, (2010) Cancer Res. Healthy cell Pathway A Pathway B Active cancer cell Pathway A Pathway B Dead cancer cell Pathway A Pathway B Active cancer cell Pathway A Pathway B


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6 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Strong Drug Development and Commercial Expertise Leaders in Synthetic Lethality and Targeted Therapy Management Board of Directors Richard Peters, M.D., Ph.D. Chairman of the Board Oren Gilad, Ph.D. President and CEO Jean-Pierre Bizzari, M.D. Director Marc Duey Director Michael Grissinger Director Gabriela Gruia, M.D. Director John Henneman Director Rifat Pamukcu, M.D. Director Bernd R. Seizinger, M.D., Ph.D. Director Oren Gilad, Ph.D. President and CEO John P. Hamill Sr. Vice President and CFO Philippe Pultar, MD Head of WEE1 Clinical Development Ze’ev Weiss, CPA, B.Sc. Chief Business Advisor Mike Carleton, Ph.D. Translational Medicine Advisor Brian Wiley SVP, Corporate Strategy


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7 © 2025 Aprea Therapeutics, Inc. All Rights Reserved WEE1 Inhibitor: APR-1051 ACESOT-1051: Clinical Proof-of-Concept


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8 © 2025 Aprea Therapeutics, Inc. All Rights Reserved WEE1 – Clinically Validated Target Examples for Phase 2 Studies with Adavosertib as monotherapy 1 AZD-1775. AstraZeneca announced in July 2022 the discontinuation of development of AZD-1775 due to its tolerability profile 2 Phase II Study of the WEE1 Inhibitor Adavosertib in Recurrent Uterine Serous Carcinoma, Liu et al, J Clin Oncol. 2021;39:1531–9. 3 IGNITE: A phase II signal-seeking trial of Adavosertib targeting recurrent high-grade, serous ovarian cancer with cyclin E1 overexpression with and without gene amplification. Au-Yeung et al, Int J Gynecol Cancer 2023;33(Suppl 4):A1–A278 4 Multicenter Phase II Trial of the WEE1 Inhibitor Adavosertib in Refractory Solid Tumors Harboring CCNE1 Amplification, Fu et al, J Clin Oncol. 2023 Mar 20; 41(9): 1725–1734. Phase 2 Study Indication Evaluable Patients N ORR, RECIST Response NCT03668340 2 Recurrent uterine serous carcinoma 34 29.4% 1 CR 9 PR IGNITE 3 Recurrent high-grade, serous ovarian cancer with CCNE1 overexpression with (Cohort 1) and without (Cohort 2) gene amplification 79 Cohort 1 - 21 Cohort 2 - 58 Cohort 1: 33% 7 PR Cohort 2: 36% 3 CR 18 PR NCT03253679 4 Refractory solid tumors harboring CCNE1 amplification 30 Ovarian - 14, Breast - 3, Uterine - 3, Other - 10 All Pt: 27% (8 PR) Ovarian Pt: 36% (5 PR) Multiple Phase 2 Studies Show Substantial Single-Agent Activity Of A WEE1 Inhibitor (Adavosertib1 ) WEE1 Inhibitors have been associated with significant Grade ≥3 hematological, GI and CV toxicities The need – A highly efficient WEE1 inhibitor with an improved safety and tolerability profile


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9 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051 Demonstrated Potentially Compelling Anti-tumor Activity Pre-clinical studies with APR-1051 Data on file N=7 mice per group, APR-1051, 30 mg/kg/day Preclinical Tumor Growth Inhibition OVCAR-3


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10 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Part 2 Dose selection optimization Up to 40 patients Eligible patients ≥ 18 yo with advanced solid tumor harboring cancer-associated gene alterations CCNE1 or CCNE2 FBXW7 or PPP2R1A, KRAS-GLY12/GLY13 & TP53 USC regardless biomarker status. HPV+ oropharyngeal squamous cell carcinoma, HPV+ cervical, vaginal, or vulvar carcinoma Part 1 Dose escalation up to 39 patients Select 2 dose levels RP2D Oral single-agent APR-1051 will be administered once-daily for 28-day cycles Selected dose 1 Selected dose 2 1:1 randomization Objectives Primary: Safety, DLT, MTD/MAD, RP2D Secondary: Pharmacokinetics, Antitumor activity (RECIST/PCWG3) Exploratory: Pharmacodynamics Dose level 1 10 mg Dose level 2 20 mg Dose level 3 30 mg Dose level 4 50 mg Dose level 5 70 mg Dose level 6 90 mg Dose level 7 120 mg Dose level 8 150 mg = cleared Accelerated titration; 1-6 patients per dose level BOIN design; 3-12 patients per dose level R Currently enrolling ACESOT-1051: Study Design Data Cutoff: March 4, 2025


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11 © 2025 Aprea Therapeutics, Inc. All Rights Reserved MedDRA Preferred Term APR-1051 All dose levels N=9 Treatment related AEsa , n All Grades Grade ≥ 3b Alanine aminotransferase increased 2 1 Aspartate aminotransferase increased 2 1 Dyspepsia 1 0 Gastroesophageal reflux disease 1 0 Lymphocyte count decreased 1 1 Nausea 2 0 Vomiting 1 0 a A patient may have more than one AE and/or have an AE more than once b Grade 3 unless otherwise indicated Not all data source verified ACESOT-1051: Treatment Related Adverse Events, AEs Data Cutoff: March 4, 2025


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12 © 2025 Aprea Therapeutics, Inc. All Rights Reserved WEE1 Inhibitor: APR-1051 Potentially Differentiated Clinical Stage WEE1i


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13 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051 Potentially Best in Class WEE1 Inhibitor Potent and Structurally Differentiated, with High Selectivity to Limit Off-target Toxicity AstraZeneca Adavosertib (AZD-1775) Zentalis Azenosertib (ZN-c3) Aprea APR-1051 Undisclosed


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14 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051: Potentially Best-in-Class WEE1 Inhibitor Potent WEE1i that Does Not Substantially Inhibit PLK1, PLK2 or PLK3 -10 -9 -8 -7 -6 -5 -4 0 25 50 75 100 125 PLK1 IC50 Determination Log10 [conc] (M) % Activity ZN-c3 APR-1051 -10 -9 -8 -7 -6 -5 -4 0 25 50 75 100 125 PLK2 IC50 Determination Log10 [conc] (M) % Activity ZN-c3 APR-1051 -10 -9 -8 -7 -6 -5 -4 0 25 50 75 100 125 PLK3 IC50 Determination Log10 [conc] (M) % Activity ZN-c3 APR-1051 ZN-c3 = 92.1 nM APR-1051 = 15,900 nM PLK1 Inhibition IC50 >150-fold difference ZN-c3 = 32.0 nM APR-1051 = 1,800 nM PLK2 Inhibition IC50 >50-fold difference ZN-c3 = 52.2 nM APR-1051 = 31,600 nM PLK3 Inhibition IC50 >600-fold difference On-target WEE1 activity Off-target inhibition of PLK1, PLK2 and PLK3 ZN-c3 = 2.9 nM APR-1051 = 1.6 nM WEE1 Inhibition IC50 similar to ZN-c3 1 1 1 8 1 1 c3 WEE1 IC50 Determination % Activity Log10 [conc] (M) AACR-NCI-EORTC Meeting, Poster B323, 2024


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15 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Studies Show PLK1 Suppression is Associated with Sepsis-Induced Loss of Intestinal Barrier Function 1 PLK1 protects against sepsis-induced intestinal barrier dysfunction, Cao et al, Scientific Reports (2018). 2 PLK1 protects intestinal barrier function in sepsis: A translational research, Cao et al, Cytokine (2023). 3 PLK1 protects intestinal barrier function in sepsis: A translational research, Cao et al, Molecular Medicine (2022). 4 LncRNA DANCR improves the dysfunction of the intestinal barrier and alleviates epithelial injury by targeting the miR‐1306‐5p/PLK1 axis in sepsis, Wang et al., Cell Biology International (2021).


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16 © 2025 Aprea Therapeutics, Inc. All Rights Reserved PLK1 Inhibition Reduces Cytotoxic Effects of WEE1 Inhibitors Minimal PLK1 Co-inhibition Enables Full Therapeutic Potential Of APR-1051 37 nM 111 nM 333 nM 1 µM 37 nM 111 nM 333 nM 1 µM Phos-H2AX Control (MCM3) NT Phos-CDK1 APR-1051 75 nM GSK-461364 0 nM NT 675 nM 25 nM 225 nM 75 nM Phos– H2AX Control (MCM3) Phos-CDK1 300 nM APR-1051 + increasing GSK-461364 Control (MCM3) 37 nM 111 nM 333 nM 1 µM 37 nM 111 nM 333 nM NT 1 µM Phos-H2AX 400 nM BI-2536 APR-1051 Phos-CDK1 Dose range of PLK inhibitor GSK-461364 in combination with a single dose of APR-1051 in OVCAR-3 cells PLK inhibitor, GSK-461364 interferes with the effects of APR-1051 in OVCAR-3 cells PLK inhibitor, BI-2536, interferes with the effects of APR-1051 in OVCAR-3 cells AACR-NCI-EORTC Meeting, Poster B323, 2024


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17 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051 Preclinical Data Highlight Potentially Favorable PK Properties Note: Head-to-head studies have not been conducted 1 Data from an exploratory formulation of APR-1051 administered to fasted Balb/c mice 2 Data from study in A-427 NSCLC xenograft model as reported in Zentalis Corporate Overview, March 2022 Based on Pre-clinical Studies, APR-1051 Shows Potentially Favorable Drug Exposure APR-10511 Zentalis Azenosertib (ZN-c3)2 AstraZeneca Adavosertib (AZD-1775)2 Dose (mg/kg/d) 10 20 40 80 20 40 80 Cmax ng/ml 1,460 1,167 1,997 5,100 635 2,460 4,703 Tmax hr 3 1 1 1 1 1 1 AUC0-24, ng*hr/ml 16,739 4,863 17,088 39,722 1,494 6,313 13,408 AACR-NCI-EORTC Meeting, Poster C147, 2023


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18 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051 Shows Negligible Inhibition of hERG Channels In vitro kinase assays IC50 Average WEE1 kinase IC50 hERG inhibition IC50 Average hERG IC50 Fold difference between kinase IC50 and hERG IC50 LanthaScreen (Thermo) Hotspot (Reaction Biology) HEK293 cells (Medicilon) CHO cells (WuXi) hERG inhibition over WEE1 kinase inhibition 2.2 nM 41.4 nM 21.8 nM 8,840 nM 660 nM 4,750 nM 218-fold (range 16- to 3,946-fold) QT prolongation AEs were reported with some competitor WEE1 inhibitors No ECG changes related to APR-1051 were observed in IND enabling studies Potential absence of QT prolongation at doses that significantly inhibit WEE1 AACR-NCI-EORTC Meeting, Poster B323, 2024


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19 © 2025 Aprea Therapeutics, Inc. All Rights Reserved APR-1051: Summary Potential best in class WEE1 inhibitor • High potency for WEE1 inhibition in vitro​ • Low off-target inhibition of the LK family of kinases​ • Suppresses growth of CCNE1-amplified HGSOC xenografted tumors and relatively well-tolerated in mice​ ACESOT-1051: First-In-Human Study (NCT06260514) • Accelerated titration dose escalation completed, fifth cohort now enrolling • Safe and well tolerated to date • Biomarker-driven study in patients with advanced/metastatic solid tumors • Targeted gene alterations include CCNE1, CCNE2, FBXW7, PPP2R1A, HPV+, or KRAS-G12 with TP53 • Open label data expected H2 2025, complete dose escalation expected H1 2026 • MD Anderson Cancer Center lead study site, with up to 10 sites in U.S.


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20 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATR Inhibitor: ATRN-119 ABOYA-119: Clinical Proof-of-Concept


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21 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ABOYA-119: Phase 1/2a - Study Overview A Phase 1/2a, Open-Label, Safety, Pharmacokinetic, and Preliminary Efficacy Study of Oral ATRN-119 in Patients with Advanced Solid Tumors Objectives: Primary • Safety, MTD, RP2D • Pharmacokinetics Secondary • Antitumor activity (RECIST/PCWG3) Exploratory • Association between identified mutations and clinical outcomes Patient population: Male or female subjects 12 years of age or older with solid tumors harboring specific DDR mutations per NGS Sites: 7 US sites for dose escalation • University of Pennsylvania • Mary Crowley Cancer Research • University Hospitals Cleveland Medical Center • Yale Cancer Center • Next Oncology: San Antonio, Dallas, Virginia Patient enrollment: Up to 132 patients in total • Escalation phase: up to 72 patients • Expansion phase: up to 60 patients ATRN-119 is an oral ATR kinase inhibitor given daily Part 1 Up to 72 patients Dose escalation (9 dose levels) 3+3 design Part 2 Up to 60 patients Dose expansion, after MTD / RP2D established


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22 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Dose level 1 50 mg Dose level 2 100 mg Dose level 3 200 mg Dose level 4 350 mg Dose level 5 550 mg Dose level 6 800 mg Dose level 7 1100 mg Dose level 8 1300 mg Dose level 9 1500 mg Once-daily dosing (up to 54 patients) Twice-daily dosing (up to 18 patients) Currently enrolling Part 1. Dose escalation (up to 72 patients) MTD/RP2D Single-agent ATRN-119 after MTD/RP2D is established Potential indications: prostate, endometrial cancer Dose level 7 550 mg Dose level 8 650 mg Dose level 9 750 mg Cleared Part 2. Dose expansion (up to 60 patients) Currently enrolling ABOYA-119: Clinical Study Design Data Cutoff: March 4, 2025


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23 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATRN-119 Steady State Plasma Concentrations (Cycle 1 Day 7) ATRN-119 Exhibits Near-dose Proportional Exposure Following Oral Administration Dose Level mg, once daily N AUC 0-24hr (ng*h/mL) Cmax (ng/mL) Half-life (hours) Mean (SD) Mean (SD) Mean (SD) 50 3 180 (143) 57 (56) 2.1 (1.4) 100 3 1771 (920) 277 (151) 3.8 (1.6) 200 3 1024 (162) 149 (9.2) 3.2 (0.5) 350 3 5252 (4362) 525 (320) 5.9 (0.5) 550 3 6899 (6058) 797 (522) 5.5 (1.4) • Tmax is approximately 2 hours and the half-life is estimated between 4-6 hours • The duration of systemic exposure substantially increases with each dose level AACR-NCI-EORTC Meeting, Poster B336 , 2024


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24 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ABOYA-119 Summary of Duration of Treatment Data Cutoff: March 4, 2025


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25 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ABOYA-119: Treatment Related AEs (In ≥ 2 Patients and/or any Grade ≥ 3) MedDRA Preferred Term ATRN-119 All dose levels N=30 Treatment related AEsa , n All Grades Grade ≥ 3b Diarrhea 11 1 Fatigue 10 2 Nausea 11 0 Decreased appetite 2 0 Dehydration 2 0 Dysgeusia 2 0 Vomiting 2 0 Abdominal pain 2 0 Anemia 1 1 Blood bilirubin increased 1 1 a A patient may have more than one AE and/or have an AE more than once b Grade 3 unless otherwise indicated Not all data source verified Data Cutoff: March 4, 2025


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26 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATR Inhibitor: ATRN-119 Potentially Differentiated Clinical Stage ATRi


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27 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATRN-119: First and Only Macrocyclic ATR Inhibitor1 Macrocycles: A Well-Evolved Approach for PIK-Related Kinase Inhibition (e.g., rapamycin and mTOR)2-4 1 Based on company knowledge 2 Brown, EJ et al, (1994) Nature 3 Brown, EJ et al, (1995) Nature 4 Brown, EJ and SL Schreiber, (1996) Cell Benefits of Unique Cyclic Skeleton Structure vs Competitors’ First-Generation Acyclic Structure • Increased selectivity • Improved tolerability Improved tolerability More efficacious dosing Macrocycles restrict number of conformations formed for increased selectivity Potential advantages for ATRN-119:


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28 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Reported Challenges with Other ATR Inhibitors First Generation Compounds Share Similar Core, Backbone, Toxicity, and Intermittent Dosing Schedule Note: Head-to-head studies with ATRN-119 have not been conducted 1 Phase I study of ATR inhibitor, AZD6738, as monotherapy in advanced solid tumors (PATRIOT part A, B), Dillon et al, Ann. Oncol. 2019:30 (supplement 5), Pages v165-v166 2 Poster CT084: A Phase I dose-escalation study of ATR inhibitor monotherapy with AZD6738 in advanced solid tumors (PATRIOT Part A), AACR 2017 3 First-in-Human Trial of the Oral Ataxia Telangiectasia and RAD3-Related (ATR) Inhibitor BAY 1895344 in Patients with Advanced Solid Tumors, Yap et al, Cancer Discov. 2021;11:80-91 and 2019 ASCO Poster, De-Bono et al. 4 Camonsertib in DNA damage response-deficient advanced solid tumors: phase 1 trial results, Yap et al. Nature Medicine 2023;29:1400-1411 Oral Oral Oral Oral QD & BID Dose Escalation Ongoing 160mg BID, 2-weeks-on, 2-weeks-off, or: Continuous dosing1 40mg BID, 3-days-on/4-days-off 160mg QD, 3-days-on/4-days-off No hematological toxicity has been reported. Patriot 1, Escalation Phase, 160mg, BID2 : Anemia (1/6, 17%) Patriot 2, Expansion Phase1 : Fatigue, anemia, nausea, and thrombocytopenia (not differentiated) (4/6, 67%) with continuous dosing (3/15, 20%) with 2-week-on, 2- week-off Anemia (2/2, 100%) Neutropenia (1/2, 50%) Anemia (25/95, 26%) Neutrophil count decreased (13/95, 14%) Platelet count decreased (7/95, 7%) AstraZeneca AZD67381,2 Bayer BAY18953443 Repare RP-35004 N N NH N N N N O N N N O S O HN CH3 N NH N N O N N HO O N NH Route of administration MTD/RP2 dose schedule Main Grade ≥3 hematological toxicities Aprea ATRN-119


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29 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATRN-119 Daily Dosing Supports Potential Continuous Tumor Suppression Intermittent Dosing May Lead to Tumor Resistance Tumor reduction and regrowth Continuous tumor reduction Drug “On” Drug “Off” Drug “On”


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30 © 2025 Aprea Therapeutics, Inc. All Rights Reserved ATRN-119: Summary First and only macrocyclic ATR inhibitor • Potentially differentiated from other ATR inhibitors in selectivity and toxicity profile • Continuous dosing provides increased drug exposure • Strong tumor control observed in vivo, including in challenging genetic backgrounds • Daily oral dosing provides potential continuous tumor suppression ABOYA-119: Ongoing Phase 1/2a Clinical Study (NCT04905914) • Patients with advanced solid tumors harboring specific DDR mutations • Safe and well tolerated to date • Near-dose proportional exposure following oral administration • Preliminary signs of clinical benefit


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31 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Aprea Therapeutics (NASDAQ: APRE) Intellectual Property Portfolio Financial Summary & Capitalization Investment Highlights


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32 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Strong Intellectual Property Portfolio Family 1: Ataxia Telengiectasia and Rad3-Related (ATR) Protein Kinase Inhibitors • Macrocyclic inhibitors of ATR & methods of using them to treat various cancers, filed on Oct. 13th, 2015 • Patents granted in AU, BR, CA, CN, EP, IL, IN, JP, KR, MX, HK. • 1.1: Issued on May 30, 2017 as U.S. Patent 9,663,535 • 1.2: Issued on May 29, 2018 as U.S. Patent 9,981,989 • 1.3: Issued on Feb. 5, 2019 as U.S. Patent 10,196,405 Family 2: ATR Inhibitors and Methods of Use • Carboxylic acid-containing macrocyclic ATR inhibitors, and prodrugs; methods of using these inhibitors to treat various cancers; filed on Apr. 12th, 2017 • Issued on May 28th, 2019 as U.S. Patent 10,301,324 Family 3: ATR Inhibitor Pharmaceutical Composition and Methods • International application filed on Apr. 14th, 2023 • Pharmaceutical formulation and composition of our lead molecule in the clinic • Nationalizations pending for US, AU, BR, CA, CN, EA, EP, IL, IN, JP, KR, MX, NZ, PH, SG, ZA Family 4: WEE1 Inhibitor Pharmaceutical Compositions and Methods • International Application filed on Jun. 3rd, 2022 • Composition of our lead WEE1 inhibitor compounds • Nationalizations in US, AU, BR, CA, CN, EP, IL, IN, JP, KR, MX, ZA Family 5: Methods of Treating Cancer • U.S. Provisional Application filed on Sep. 19th, 2024 • Clinical methods of treating advanced solid cancer tumors using lead molecule Family 6: Macrocyclic Undisclosed DDR target Inhibitors and Methods of their Preparation and Use • U.S. Provisional Application filed on Jan. 22, 2025


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33 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Aprea Therapeutics (NASDAQ: APRE) Financial Summary & Capitalization Securities Common Equivalents as of March 25, 2025 Preferred Stock (as converted) 28,112 Common Stock 5,491,953 Warrants: Pre-Funded Tranche A Tranche B Total 507,076 1,097,394 1,097,394 2,701,864 Options 712,990 Restricted Stock Units 23,881 Fully Diluted Equivalents 8,958,800 Cash & Equivalents of ~$22.8M as of December 31, 2024 Milestone Warrant Summary: • Tranche A warrants to purchase up to 1,097,394 shares of common stock at a exercise price of $7.29 per share for an aggregate of up to $8.0 million and will expire at the earlier of (i) 30 days following the announcement of the recommended Phase 2 dose for the Company’s ATR inhibitor program for ATRN-119 and the daily VWAP of the Company’s common stock equaling or exceeding $14.58 per share for 30 consecutive trading days following the announcement and (ii) three years from the date of issuance. • Tranche B warrants to purchase up to 1,097,394 shares of common stock at a cash exercise price of $9.1125 per share for an aggregate of up to $10.0 million and will expire at the earlier of (i) 30 days following the announcement of the recommended Phase 2 dose for the Company’s WEE1 inhibitor program for APR-1051 and the daily VWAP of the Company’s common stock equaling or exceeding $18.225 per share for 30 consecutive trading days following the announcement and (ii) five years from the date of issuance


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34 © 2025 Aprea Therapeutics, Inc. All Rights Reserved Financed into Q1 2026 • Achieve short term inflection points and catalysts • Evaluate optimal strategic partnerships Near term catalysts • APR-1051: H2 2025 Safety/efficacy data ; H1 2026 Complete dose escalation • ATRN-119: H2 2025 Complete dose escalation Diversified portfolio with best in class, de-risked clinical and preclinical programs • Highly potent and selective WEE1 (APR-1051) and ATR (ATRN-119) inhibitors • Opportunities in ovarian, colorectal, prostate, and endometrial cancers • Single agent and combination therapies Technology developed by pioneers in synthetic lethality • Management with strong drug development and commercial expertise Investment Highlights