Recent Updates
Recently added Catalysts

EXS74539

Phase 1

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

Target and mechanism

Molecular targetLSD1
Target classEnzyme
ModalitySmall molecule

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

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)
Unlock Study Endpoints

Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EXS74539EXPERIMENTALEXS74539

Interventions

NameTypeDescription
EXS74539DRUGOral administration
Unlock Study Design Details

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
Unlock Eligibility Criteria

Competitive Landscape -Other Solid Tumors 9 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 used for in solid tumors?

EXS74539 is an investigational small molecule 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 currently in Phase 1 clinical development.

What does EXS74539 target?

EXS74539 targets LSD1, an enzyme involved in epigenetic regulation. By inhibiting LSD1, the drug aims to alter gene expression in cancer cells. This target is being explored in the context of multiple solid tumor types, with the goal of developing a targeted therapeutic approach for patients with these malignancies.

Who is developing EXS74539?

EXS74539 is being developed by Recursion Pharmaceuticals, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol RXRX. The company is conducting a Phase 1 clinical trial to evaluate the safety and tolerability of this investigational drug in patients with select solid tumors.

What phase is EXS74539 in?

EXS74539 is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. The ongoing Phase 1 trial is a dose-determining study designed to evaluate the drug's safety, tolerability, and pharmacokinetics in participants with select solid tumors.

What clinical trials is EXS74539 in?

EXS74539 is being evaluated in a single Phase 1 clinical trial with the identifier NCT07517198. This trial, titled "Dose Determining Study of EXS74539 (REC-4539) in Participants With Select Solid Tumors," is currently recruiting participants in the United States. The study is uncontrolled, non-randomized, and open-label, with an enrollment target of 40 participants.

Is EXS74539 the same as REC-4539?

Yes, EXS74539 is also known as REC-4539. The clinical trial NCT07517198 refers to the drug as EXS74539 (REC-4539), indicating that both names are used interchangeably for the same investigational compound. This naming convention is common during drug development, where different codes may be assigned by the sponsor.