Study of GS-2426 in Participants With Advanced Solid Tumors

July 31, 2026 updated by: Gilead Sciences

A Phase 1, Multicenter, Open-Label Clinical Study to Evaluate the Safety and Tolerability of GS-2426 in Participants With Advanced MTAP-Deleted Solid Tumors

The goal of this clinical study is to learn more about the study drug GS-2426, and how safe and tolerable it is in participants with advanced methylthioadenosine phosphorylase (MTAP)-deleted solid tumors.

The primary objective of this study is to evaluate the safety and tolerability of GS-2426 in participants with MTAP-deleted advanced solid tumors and to determine the maximum tolerated dose (MTD)/maximum administered dose (MAD) and the recommended phase II dose (RP2D).

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.
174

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.

Study Locations

  • United States
    • Michigan
      • Grand Rapids, Michigan, United States, 49546
        • Recruiting
        • START Midwest
    • New Jersey
      • East Brunswick, New Jersey, United States, 08816
        • Recruiting
        • START Astera, LLC
    • New York
      • New York, New York, United States, 10065
        • Recruiting
        • Memorial Sloan Kettering Cancer Center
    • Texas
      • San Antonio, Texas, United States, 78229
        • Recruiting
        • START San Antonio, LLC

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

Key Inclusion Criteria:

  • Participants 18 years of age or older (≥ 19 years old for participants in South Korea).
  • Histologically or cytologically confirmed advanced malignant solid tumors, who have progressed on, are intolerant to or are ineligible for standard therapy, or have no standard treatment options.
  • Participant tumors are methylthioadenosine phosphorylase (MTAP)-deficient.
  • Adequate organ function
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
  • All participants must provide a pretreatment tumor tissue sample.

Key Exclusion Criteria:

  • Participants with plans to breastfeed during the study period or within 7 days following the last dose of study intervention.
  • Have not recovered (ie, returned to Grade 1 or baseline) from clinically significant adverse events (AEs) due to a previously administered agent or a previous intervention as assessed by the investigator.
  • Active second malignancy. Individuals with a history of malignancy who have been completely treated with no evidence of active cancer for 5 years prior to enrollment, or individuals with surgically cured tumors with low risk of recurrence may be enrolled.
  • Requirement for ongoing therapy with any prohibited medications .
  • Prior therapy with a protein arginine methyltransferase 5 (PRMT5) inhibitor or methionine adenosine transferase 2a (MAT2A) inhibitor.
  • Have serious infection requiring antibiotics within 14 days prior to the first dose.
  • Uncontrolled concurrent diseases

Note: Other protocol defined Inclusion/Exclusion criteria may apply.

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: Non-Randomized
  • Interventional Model: Sequential 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: Phase 1a: Monotherapy Dose Escalation
Participants will receive escalating doses of GS-2426 monotherapy, until disease progression, or until the participant meets other study drug discontinuation criteria as specified in protocol, or up to a maximum of 105 week, whichever occurs first.
Drug: GS-2426
Administered Orally
Experimental: Phase 1b: Monotherapy Dose Expansion
Participants will be enrolled in different indication-specific cohorts. Participants will receive GS-2426 monotherapy at the recommended dose until disease progression, or until the participant meets other study drug discontinuation criteria as specified in protocol, or up to a maximum of 105 weeks, whichever occurs first.
Drug: GS-2426
Administered Orally

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
Time Frame
Percentage of Participants Experiencing Treatment-Emergent Adverse Events (AEs) and Serious Adverse Events (SAE)
Time Frame: First dose up to 30 days post last dose (up to 105 weeks)
First dose up to 30 days post last dose (up to 105 weeks)
Percentage of Participants Experiencing Clinical Laboratory Abnormalities
Time Frame: First dose up to 30 days post last dose (up to 105 weeks)
First dose up to 30 days post last dose (up to 105 weeks)
Maximum Tolerated Dose (MTD)/Maximum Administered Dose (MAD)
Time Frame: First dose up to 21 days post first dose
First dose up to 21 days post first dose
Recommended Phase 2 Dose (RP2D)
Time Frame: Predose to end of study (up to 105 weeks)
Predose to end of study (up to 105 weeks)
Percentage of Participants Experiencing Any Dose-limiting Toxicities (DLTs)
Time Frame: First dose up to 21 days post first dose
First dose up to 21 days post first dose

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
Plasma Concentration of GS-2426
Time Frame: Predose and postdose up to end of treatment (up to 105 weeks)
Predose and postdose up to end of treatment (up to 105 weeks)
Pharmacokinetic (PK) Parameter: AUC0-24h of GS-2426
Time Frame: Predose and postdose up to end of treatment (up to 105 weeks)
AUC0-24h is defined as the area under concentration versus time from 0 to 24 hours.
Predose and postdose up to end of treatment (up to 105 weeks)
PK Parameters: Cmax of GS-2426
Time Frame: Predose and postdose up to end of treatment (up to 105 weeks)
Cmax is defined as the maximum observed plasma drug concentration.
Predose and postdose up to end of treatment (up to 105 weeks)
PK Parameters: Tmax of GS-2426
Time Frame: Predose and postdose up to end of treatment (up to 105 weeks)
Tmax is defined as the time to peak plasma drug concentration of GS-2426.
Predose and postdose up to end of treatment (up to 105 weeks)

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.
Gilead Sciences

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Gilead Study Director, Gilead Sciences

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

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 2, 2026

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.
January 1, 2029

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.
January 1, 2029

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).
May 15, 2026

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.
May 15, 2026

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.
May 22, 2026

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 3, 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.
July 31, 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.
July 1, 2026

More Information

Terms related to this study

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.
  • GH31C101A

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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