A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Effectiveness of GSK4418959 Alone or in Combination With Other Anti-cancer Agents in Participants With Solid Tumors

NCT ID: NCT06710847

Last Updated: 2026-02-02

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

ACTIVE_NOT_RECRUITING

Clinical Phase

PHASE1/PHASE2

Total Enrollment

14 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-12-13

Study Completion Date

2026-06-22

Brief Summary

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Solid tumours are abnormal lumps of tissue that can occur in different parts of the body. The tumours involved in this study have specific genetic characteristics that can make them more aggressive and challenging to treat. The study will test whether GSK4418959 alone or in combination with a PD-1 inhibitor agent can decrease tumor size, is safe, well-tolerated, and how amounts of the study drug decrease in the body over time.

Detailed Description

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Conditions

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Neoplasms, Colorectal Solid Tumor Colon Cancer Rectal Cancer Endometrial Cancer

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

SEQUENTIAL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Part 1: Dose escalation of GSK4418959 monotherapy

Participants will receive GSK4418959 as monotherapy.

Group Type EXPERIMENTAL

GSK4418959

Intervention Type DRUG

GSK4418959 will be administered.

Part 2: Dose expansion of GSK4418959 monotherapy

Participants will receive GSK4418959 as monotherapy.

Group Type EXPERIMENTAL

GSK4418959

Intervention Type DRUG

GSK4418959 will be administered.

Part 3: Dose escalation of GSK4418959 plus PD-1 inhibitor

Participants will receive GSK4418959 plus PD-1 inhibitor.

Group Type EXPERIMENTAL

GSK4418959

Intervention Type DRUG

GSK4418959 will be administered.

PD-1 inhibitor

Intervention Type BIOLOGICAL

PD-1 inhibitor will be administered.

Interventions

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GSK4418959

GSK4418959 will be administered.

Intervention Type DRUG

PD-1 inhibitor

PD-1 inhibitor will be administered.

Intervention Type BIOLOGICAL

Eligibility Criteria

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Inclusion Criteria

* Has a histologically diagnosed advanced (unresectable, metastatic or recurrent) solid tumor
* Has a known dMMR/MSI-H status as determined by a certified local laboratory at the time of Pre-screening or has an unknown Mismatch repair (MMR)/ Microsatellite Instability (MSI) status at the time of Pre-screening and MMR/MSI status will be determined by central reference laboratory
* Provides an archival or fresh (preferred) formalin fixed, paraffin embedded (FFPE) sample
* Intends to receive GSK4418959 (alone or in combination with PD-1 inhibitor, as determined between Investigator and sponsor) as next line of treatment
* Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0-2
* Is expected to have a minimum of 3 months life expectancy
* Has adequate organ function, as defined in the protocol


• Has histologically diagnosed advanced (unresectable, metastatic or recurrent) solid tumor and has exhausted all standard of care treatment options


* Has histologically diagnosed advanced (unresectable, metastatic or recurrent) Colorectal cancer (CRC) or Endometrial cancer (EC)
* Has received at least 1 but no more than 3 lines of systemic anticancer therapy for their advanced (unresectable, metastatic or recurrent) disease including at least one line of Immune checkpoint inhibitors (ICI) therapy
* Has measurable disease (i.e., at least 1 target lesion) during the Screening period per RECIST 1.1, as determined by the investigator

Exclusion Criteria

* Has not recovered (i.e., to Grade ≤1 or to baseline) from prior anticancer therapy-induced AEs
* Has received prior treatment with a WRN inhibitor
* Is unable to swallow and retain orally administered study treatment
* Has symptomatic uncontrolled brain or leptomeningeal metastases
* Has a known additional malignancy that progressed or required active treatment within the last 2 years because reoccurrence of another malignancy would confound interpretation by RECIST 1.1 criteria. Exceptions include basal cell carcinoma of the skin, squamous cell carcinoma of the skin that has undergone potentially curative therapy, or in situ cancer that is considered to be low risk for progression by the investigator
* Has any impairment of gastrointestinal function or gastrointestinal disease that may significantly alter the absorption of study drugs
* Has severe liver fibrosis
* Has cirrhosis or current unstable liver or biliary disease
* Has known hypersensitivity to any of the study interventions or any of their excipients
* Has known WRN syndrome
* Has an active autoimmune disease that has required systemic treatment in the past 2 years


* Has experienced any of the following with prior immunotherapy: any immune mediated adverse events (imAE) of Grade ≥3, immune-related severe neurologic events of any grade, exfoliative dermatitis of any grade (Stevens-Johnson Syndrome, toxic epidermal necrolysis, or Drug rash with eosinophilia and systemic signs syndrome \[DRESS\] syndrome), or myocarditis of any grade. Non-clinically significant laboratory abnormalities are not exclusionary
* Has any history of interstitial lung disease or pneumonitis
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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IDEAYA Biosciences

INDUSTRY

Sponsor Role collaborator

GlaxoSmithKline

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Locations

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GSK Investigational Site

Los Angeles, California, United States

Site Status

GSK Investigational Site

Denver, Colorado, United States

Site Status

GSK Investigational Site

Detroit, Michigan, United States

Site Status

GSK Investigational Site

New York, New York, United States

Site Status

GSK Investigational Site

Philadelphia, Pennsylvania, United States

Site Status

GSK Investigational Site

Philadelphia, Pennsylvania, United States

Site Status

GSK Investigational Site

Melbourne, Victoria, Australia

Site Status

GSK Investigational Site

Brussels, , Belgium

Site Status

GSK Investigational Site

Ghent, , Belgium

Site Status

GSK Investigational Site

Leuven, , Belgium

Site Status

GSK Investigational Site

Chiba, , Japan

Site Status

GSK Investigational Site

Shizuoka, , Japan

Site Status

GSK Investigational Site

Tokyo, , Japan

Site Status

GSK Investigational Site

Tokyo, , Japan

Site Status

GSK Investigational Site

Amsterdam, , Netherlands

Site Status

GSK Investigational Site

Daegu, , South Korea

Site Status

GSK Investigational Site

Gyeonggi-do, , South Korea

Site Status

GSK Investigational Site

Seoul, , South Korea

Site Status

GSK Investigational Site

Barcelona, , Spain

Site Status

GSK Investigational Site

Barcelona, , Spain

Site Status

GSK Investigational Site

Madrid, , Spain

Site Status

GSK Investigational Site

Málaga, , Spain

Site Status

Countries

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United States Australia Belgium Japan Netherlands South Korea Spain

Other Identifiers

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2024-519721-37-00

Identifier Type: CTIS

Identifier Source: secondary_id

221971

Identifier Type: -

Identifier Source: org_study_id

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