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GTAEXS617

Phase 1

Head and Neck Squamous Cell Carcinoma (HNSCC) | Small molecule | Oncology |Recursion Pharmaceuticals, Inc.|Trials Updated: Aug 13, 2026

GTAEXS617 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Aug 2023

GTAEXS617 target and mechanism

Molecular targetCDK7
ModalitySmall molecule

Also known as REC-617

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials1
Total Enrollment230

FDA Designations

No designations recorded

GTAEXS617 clinical trials

GTAEXS617 · 1 trial · 6 indications

Phase 1 1
NCT05985655Study to Assess GTAEXS617 in Participants With Advanced Solid TumorsHead and Neck Squamous Cell Carcinoma (HNSCC)
RECRUITING230 Analytics
PHASE1RECRUITING
Study to Assess GTAEXS617 in Participants With Advanced Solid Tumors
Head and Neck Squamous Cell Carcinoma (HNSCC)Unlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment Emergent Adverse Events (TEAEs)
Up to 2 years
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs)
Up to 28 days
Phase 2 : Objective Response Rate (ORR) as Assessed by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1
Up to 2 years

Secondary Endpoints

Phase 1: ORR as Assessed by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1
Up to 2 years
Maximum Plasma Concentration (Cmax) of GTAEXS617
Predose up to 24 hours postdose
Time Maximum Plasma Concentration (Tmax) of GTAEXS617
Predose up to 24 hours postdose
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Phase 1: Dose Escalation MonotherapyEXPERIMENTALParticipants will receive GTAEXS617 oral tablets in increasing doses.
Phase 1: Dose Escalation Combination TherapyEXPERIMENTALParticipants will receive GTAEXS617 oral tablets in increasing doses in combination with standard of care (SoC) treatment.
Phase 2: Dose Expansion MonotherapyEXPERIMENTALParticipants will receive GTAEXS617 oral tablets at Recommended Phase 2 Dose (RP2D).
Phase 2: Dose Expansion Combination TherapyEXPERIMENTALParticipants will receive GTAEXS617 oral tablets at RP2D in combination with SoC treatment.

Interventions

NameTypeDescription
GTAEXS617DRUGAdministered as specified in the treatment arm.
SoCDRUGParticipants will receive selected SoC regimen (fulvestrant, paclitaxel + bevacizumab, pegylated liposomal doxorubicin, or capecitabine) administered as specified in the treatment arm.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites15

Key Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) performance status 0-1. * Life expectancy \> 3 months. * One of the following histologically or cytologically confirmed advanced solid tumors: head and neck squamous cell carcinoma (HNSCC), pancreatic adenocarcinoma, non-small cell...

Countries:United StatesBelgiumUnited Kingdom
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Recent Changes (Last 90 Days)

LOWAug 14, 2026NCT05985655lastUpdatePostDate: changed
LOWAug 14, 2026NCT05985655lastUpdatePostDate: changed
LOWAug 14, 2026NCT05985655lastUpdatePostDate: changed

Frequently asked questions about GTAEXS617

What is GTAEXS617 used for?

GTAEXS617 is an investigational small molecule being studied in adults with advanced solid tumors, including head and neck squamous cell carcinoma (HNSCC). The Phase 1 trial also enrolls patients with pancreatic adenocarcinoma, non-small cell lung cancer, platinum-resistant high-grade epithelial ovarian cancer, HR+/HER2- breast carcinoma, and triple negative breast cancer.

What does GTAEXS617 target?

GTAEXS617 targets CDK7, a cyclin-dependent kinase involved in cell cycle regulation and transcription. By inhibiting CDK7, the drug is designed to interfere with processes that cancer cells rely on to grow and divide. It is being developed as an oral small molecule for advanced solid tumors.

Who is developing GTAEXS617?

GTAEXS617 is being developed by Recursion Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker RXRX. Recursion is the sponsor of the clinical program evaluating the compound in advanced solid tumors, including head and neck squamous cell carcinoma.

What phase is GTAEXS617 in?

GTAEXS617 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 1 study is enrolling adults with advanced solid tumors to evaluate the compound, and no trials of GTAEXS617 have been completed to date.

What clinical trials is GTAEXS617 in?

GTAEXS617 is being evaluated in one active clinical trial, NCT05985655, titled a study to assess GTAEXS617 in participants with advanced solid tumors. The Phase 1 trial is currently recruiting, has an estimated enrollment of 230 participants, and is running in the United States, Belgium, and the United Kingdom.

Is GTAEXS617 biomarker selected?

Yes. The Phase 1 trial of GTAEXS617, NCT05985655, is biomarker selected, meaning enrollment is guided by biomarker criteria. The study is a controlled trial in adults 18 years and older with advanced solid tumors, including head and neck squamous cell carcinoma, and it is currently recruiting participants.