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GSK4418959

Phase 1

Neoplasms, Colorectal | Small molecule | Oncology |GSK plc|Last Updated: Feb 2, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment14
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06710847A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Effectiveness of GSK4418959 Alone or in Combination With Other Anti-cancer Agents in Participants With Solid TumorsPHASE1 ACTIVE NOT_RECRUITING 14Dec 13, 2024Jun 22, 2026Feb 2, 202622 United States, Australia +5
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Study Endpoints
Primary Endpoints
Part 1: Number of participants with dose limiting toxicities (DLTs) during DLT observation period
Up to 21 days
Part 3: Number of participants with dose limiting toxicities (DLTs) during DLT observation period
Up to 21 days
Part 1: Number of participants with treatment emergent adverse events (TEAEs) during DLT observation period
Up to 21 days
Part 3: Number of participants with treatment emergent adverse events (TEAEs) during DLT observation period
Up to 21 days
Part 1: Number of participants with dosage interruptions, dose reductions, and drug discontinuations for TEAEs during DLT observation period
Up to 21 days
Part 3: Number of participants with dosage interruptions, dose reductions, and drug discontinuations for TEAEs during DLT observation period
Up to 21 days
Part 2: Objective Response Rate (ORR)
Up to approximately 26 months

ORR is defined as percentage of participants with confirmed complete response (CR) or partial response (PR) per Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST 1.1) by investigator assessment.

Secondary Endpoints
Part 1: Area under the concentration-time curve (AUC) for GSK4418959
From first day of dosing for the duration of treatment until end of interventional phase (EOI) (up to approximately 42 months)
Part 1: Maximum concentration (Cmax) for GSK4418959
From first day of dosing for the duration of treatment until end of interventional phase (EOI) (up to approximately 42 months)
Part 1: Time to maximum concentration (Tmax) for GSK4418959
From first day of dosing for the duration of treatment until end of interventional phase (EOI) (up to approximately 42 months)
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: Dose escalation of GSK4418959 monotherapyEXPERIMENTALParticipants will receive GSK4418959 as monotherapy.
Part 2: Dose expansion of GSK4418959 monotherapyEXPERIMENTALParticipants will receive GSK4418959 as monotherapy.
Part 3: Dose escalation of GSK4418959 plus PD-1 inhibitorEXPERIMENTALParticipants will receive GSK4418959 plus PD-1 inhibitor.
Interventions
NameTypeDescription
GSK4418959DRUGGSK4418959 will be administered.
PD-1 inhibitorBIOLOGICALPD-1 inhibitor will be administered.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria: Parts 1, 2, and 3 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)...

Countries:United StatesAustraliaBelgiumJapanNetherlandsSouth KoreaSpain
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06710847primaryCompletionDate: changed
LOWMay 24, 2026NCT06710847studyFirstPostDate: changed