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CGT4255

Phase 1

Advanced Solid Tumor, Adult | Small molecule | Oncology |Cogent Biosciences, Inc.|Last Updated: Feb 27, 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
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment100
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07361562A Study of a Selective ERBB2 Inhibitor (CGT4255), in Patients With Advanced Solid TumorsPHASE1 RECRUITING 100Dec 30, 2025Nov 1, 2028Feb 27, 20266 United States
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Study Endpoints
Primary Endpoints
Incidence and grade of Adverse Events (AEs) and Serious Adverse Events (SAEs) [Part A]
Approximately 12 months

1\. Incidence and grade of Adverse Events (AEs) and Serious Adverse Events (SAEs) and AEs leading to dose modifications and dose limiting toxicities (DLTs) to determine the maximum tolerated dose (MTD) or the maximum evaluated dose (MED) in participants with ERBB2-altered advanced solid tumors

Overall Response Rate [Part B and Part C]
Approximately 6 months

Overall Response Rate (ORR), determined by confirmed CR + PR of all lesions (intracranial and extracranial), based on Investigator assessment using the whole-body RECIST v1.1 in participants with ERBB2-mutated NSCLC with Brain Metastases (BM) and in participants with ERBB2-mutated or HER2-positive breast cancer with BM ± leptomeningeal disease (LMD)

Secondary Endpoints
Incidence and grade of Adverse Events (AEs) and Serious Adverse Events (SAEs) [Part B and C]
Approximately 7 months
Pharmacokinetics [Part A]
Approximately 28 days
Pharmacokinetics [Part A)
Approximately 28 days
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Dose EscalationEXPERIMENTALPart A: Dose Escalation Multiple doses of CGT4255 for oral administration
Signal Seeking and Dose EscalationEXPERIMENTALPart B: Signal Seeking and Dose Optimization Oral dose(s) of CGT4255 at the selected dose levels determined in Phase 1
Signal SeekingEXPERIMENTALPart C: Includes signal seeking. Participants will receive CGT4255 at a dose level selected based on data from Part A
Interventions
NameTypeDescription
CGT4255DRUGCGT4255 Daily Oral Administration
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites6

Inclusion Criteria: 1. Have histologically confirmed diagnosis of: 1. Part A: Locally advanced, metastatic, and/or unresectable solid tumor with documented ERBB2-activating alteration or NRG1 gene fusion in blood and/or tumor or HER2 overexpression in tumor 2. Part B: Locally advanced, metas...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07361562primaryCompletionDate: changed
LOWMay 24, 2026NCT07361562studyFirstPostDate: changed