Study of APR-1051 in Patients With Advanced Solid Tumors (ACESOT-1051)

August 14, 2026 updated by: Aprea Therapeutics

A Phase 1, Open-Label, Multicenter, First-In-Human Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of APR-1051 in Patients With Advanced Solid Tumors

The purpose of this study is to assess the safety and effectiveness of APR-1051 through the performance of a Phase 1, open-label, safety, PK, and preliminary efficacy study of oral APR-1051 in patients with advanced solid tumors.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
90

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: Senior Medical Advisor
  • Phone Number: 215-948-4119
  • Email: info@aprea.com

Study Locations

  • United States
    • Texas
      • Houston, Texas, United States, 77030
        • Recruiting
        • MD Anderson Cancer Center (MDACC)
        • Principal Investigator:
          • Timothy Yap, MD
        • Contact:
          • Jessica Rhudy
        • Contact:
      • Houston, Texas, United States, 77054
        • Recruiting
        • NEXT Oncology- Houston
        • Principal Investigator:
          • Jennifer Segar, MD
        • Contact:
      • Irving, Texas, United States, 75039
        • Recruiting
        • NEXT Oncology -Dallas
        • Principal Investigator:
          • Shiraj Sen, MD
        • Contact:
      • San Antonio, Texas, United States, 78229
        • Recruiting
        • NEXT Oncology -San Antonio
        • Principal Investigator:
          • David Sommerhalder, MD
        • Contact:
    • Virginia
      • Fairfax, Virginia, United States, 22031
        • Recruiting
        • Next Oncology -Virginia
        • Contact:
        • Principal Investigator:
          • Mohamad Salkeni, MD, FRCPC

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age ≥ 18 years
  • Diagnosis of advanced/metastatic solid tumor
  • Measurable or evaluable disease per RECIST version 1.1 (radiographic disease progression per PCWG3 criteria for patients with mCRPC)
  • Eastern Cooperative Oncology Group (ECOG) performance status ≤ 1 or Karnofsky Performance Status (KPS) ≥ 70%
  • Patients must have recovered to Grade 1 or baseline levels from toxicity or adverse events related to prior treatment for their cancer, excluding Grade ≤ 2 neuropathy, alopecia, or skin pigmentation
  • Adequate bone marrow and organ function
  • Women of child-bearing potential (WOCBP) or men of child-fathering potential must agree to use adequate contraception prior to study entry

Exclusion Criteria:

  • Patient has had prior systemic anti-cancer therapy (cytotoxic chemotherapy, immunotherapy, targeted therapy) within 3 weeks (6 weeks in cases of mitomycin C, nitrosourea, lomustine) or at least 5 half-lives (whichever is shorter, but no less than 2 weeks) prior to Day 1
  • Prior radiation therapy at the target lesion unless there is evidence of disease progression. If patient has had prior radiation therapy for disease progression, see Exclusion Criterion 1 for allowed interval between radiotherapy and Day 1 and recovery of AEs
  • Treatment with any investigational agent administered within 30 days or 5 half-lives, whichever is shorter, before the first dose of APR-1051
  • Major surgery within 21 days prior to Day 1
  • Concomitant treatment with other anti-cancer therapy, including chemotherapy, immunotherapy, biological therapy, radiation therapy (except palliative local radiation therapy), or other novel anti-cancer agents. Note: endocrine therapy for breast and prostate cancer is allowed along with agents to treat or prevent skeletal related events (zoledronic acid, pamidronate, denosumab)
  • Subjects with active (uncontrolled, metastatic) second malignancies or requiring therapy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: APR-1051
Dose Escalation based on BOIN Design
Drug: APR-1051
WEE1 Inhibitor

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Treatment-related adverse events
Time Frame: Day 1 to 28, each cycle is 28 days
  • Part 1 dose escalation: Incidence of adverse Events (AE), serious AEs (SAE), treatment-related AEs, AEs that would qualify as a dose-limiting toxicity (DLT), changes in clinical laboratory values, vital signs, ECG, ECHO
  • Part 1 dose escalation: Severity of adverse Events (AE), serious AEs (SAE), treatment-related AEs, and changes in clinical laboratory values, vital signs, ECG, ECHO according to National Cancer Institute Common Terminology Criteria for Adverse Events v5.0
Day 1 to 28, each cycle is 28 days
Recommended dose of APR-1051
Time Frame: Day 1 to 28, each cycle is 28 days
•Part 1 dose escalation: Recommended Phase 2 Dose (RP2D) of APR-1051 monotherapy [Time frame: Day 1 through to start of dose expansion phase]. The RP2D of will be determined based on review of safety, tolerability, pharmacokinetics/pharmacodynamics, and preliminary efficacy data
Day 1 to 28, each cycle is 28 days

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Pharmacokinetics: Cmax/Cmin of APR-1051
Time Frame: Day 1 to 112
Plasma concentration of APR-1051: maximum (Cmax), minimum (Cmin)
Day 1 to 112
Pharmacokinetics: Tmax of APR-1051
Time Frame: Day 1 to 112
Time to peak plasma concentration of APR-1051 (Tmax)
Day 1 to 112
Pharmacokinetics: AUC of APR-1051
Time Frame: Day 1 to 112
Area under plasma versus time curve (AUC) of APR-1051 max)
Day 1 to 112
Pharmacokinetics: t1/2 of APR-1051
Time Frame: Day 1 to 112
Half-life of APR-1051 (t1/2)
Day 1 to 112

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Aprea Therapeutics

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 13, 2024

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 1, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 18, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 14, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 15, 2024

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 17, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 14, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • APR-1051-001

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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