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EXS74539

Phase 1

Solid Tumor | Small molecule | Oncology |Recursion Pharmaceuticals, Inc.|Trials Updated: Jun 10, 2026

EXS74539 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Apr 2026

EXS74539 target and mechanism

Molecular targetLSD1
Target classEnzyme
ModalitySmall molecule

Also known as REC-4539

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

EXS74539 clinical trials

EXS74539 · 1 trial · 12 indications

Phase 1 1
NCT07517198Dose Determining Study of EXS74539 (REC-4539) in Participants With Select Solid TumorsSolid Tumor
RECRUITING40 Analytics
PHASE1RECRUITING
Dose Determining Study of EXS74539 (REC-4539) in Participants With Select Solid Tumors
Solid TumorUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
Up to 3 years
Number of Participants with Dose-limiting Toxicity (DLT)
Up to 28 days
Number of Participants with Dose Interruptions and Dose Modifications
Up to 3 years

Secondary Endpoints

Maximum Concentration (Cmax) of EXS74539
Cycle 1 Day 25 and at end of treatment (up to approximately 3 years)
Time to Cmax (tmax) of EXS74539
Cycle 1 Day 25 and at end of treatment (up to approximately 3 years)
Area Under the Concentration-time Curve From Time Zero to the Time of the Last Quantifiable Concentration (AUC[0-last]) of EXS74539
Cycle 1 Day 1 through end of treatment (up to approximately 3 years)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EXS74539EXPERIMENTALEXS74539

Interventions

NameTypeDescription
EXS74539DRUGOral administration
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites3

Key Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) performance status of 0-1. * Histologically confirmed diagnosis of the following solid tumors: * SCLC * High grade neuroendocrine or small cell carcinomas of non-lung origin * Non-small cell lung cancer \[NSCLC\] * Prostat...

Countries:United States
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Competitive Landscape -Other Solid Tumors 10 trials (matched to "Solid Tumor")

Recent Changes (Last 90 Days)

LOWAug 1, 2026NCT07517198startDate: changed
LOWAug 1, 2026NCT07517198startDate: changed
LOWAug 1, 2026NCT07517198startDate: changed

Frequently asked questions about EXS74539

What is EXS74539?

EXS74539 is an investigational small molecule drug being developed by Recursion Pharmaceuticals, Inc. for the treatment of select solid tumors. It is currently in Phase 1 clinical development and has not been approved by the FDA. The drug is being studied in a dose-determining trial in adults with advanced solid tumors.

What is EXS74539 used for?

EXS74539 is being studied for the treatment of select solid tumors, including small cell lung cancer, high grade neuroendocrine cancer, non-small cell lung cancer, prostate cancer, ovarian cancer, renal carcinoma, head and neck squamous cell carcinoma, hepatic cancer, gastric cancer, and triple-negative breast cancer. It is investigational and not yet approved for any indication.

What does EXS74539 target?

EXS74539 targets LSD1, also known as lysine-specific demethylase 1, which is an enzyme. By inhibiting this enzyme, the drug is designed to act on biological pathways relevant to tumor growth. The Phase 1 trial enrolls patients with biomarker-selected solid tumors, meaning participants are chosen based on specific tumor characteristics.

Who is developing EXS74539?

EXS74539 is being developed by Recursion Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker symbol RXRX. The company is running the clinical program for this small molecule oncology candidate, which is also referred to as REC-4539 in its trial documentation.

What phase is EXS74539 in?

EXS74539 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 a dose-determining trial designed to evaluate the drug in participants with select solid tumors, and it is currently recruiting.

What clinical trials is EXS74539 in?

EXS74539 is being evaluated in one clinical trial, NCT07517198, titled Dose Determining Study of EXS74539 (REC-4539) in Participants With Select Solid Tumors. The Phase 1 trial is currently recruiting and plans to enroll approximately 40 participants aged 18 years and older in the United States. It is an uncontrolled, non-randomized study.

Is EXS74539 the same as REC-4539?

Yes, EXS74539 is also known as REC-4539. The two names refer to the same investigational small molecule. The Phase 1 trial is listed under both names, so readers searching for REC-4539 will find the same drug and the same clinical program being developed by Recursion Pharmaceuticals, Inc.