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Dose Determining Study of EXS74539 (REC-4539) in Participants With Select Solid Tumors

A Phase 1, Multicenter, Open-Label, Dose-Escalation Study to Assess Safety, Tolerability, and Efficacy of EXS74539 as Monotherapy in Participants With Select Solid Tumors

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07517198
Enrollment
40
Registered
2026-04-08
Start date
2026-04-13
Completion date
2029-03-01
Last updated
2026-06-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Gastric Cancer, Head and Neck Squamous Cell Carcinoma (HNSCC), Hepatic Cancer, High Grade Neuroendocrine Cancer, Non-small Cell Lung Cancer (NSCLC), Ovarian Cancer, Prostate Cancer, Renal Carcinoma (Clear and Non-clear Cell), Small Cell Carcinomas of Non-lung Origin, Small Cell Lung Cancer (SCLC), Solid Tumor, Triple-negative Breast Cancer (TNBC)

Keywords

Solid Tumors, Small Cell Lung Cancer (SCLC), High grade neuroendocrine cancer, Small cell carcinomas of non-lung origin, Non-small cell lung cancer (NSCLC), Prostate cancer, Ovarian cancer, Renal carcinoma (clear and non-clear cell), Head and neck squamous cell carcinoma (HNSCC), Hepatic cancer, Gastric cancer, Triple-negative breast cancer (TNBC), LSD1 inhibitor, EXS74539, REC-4539

Brief summary

The primary purpose of this study is to determine the safety, tolerability, and maximum tolerated dose (MTD) of EXS74539 (REC-4539) in participants with select solid tumors.

Interventions

DRUGEXS74539

Oral administration

Sponsors

Exscientia AI Ltd., a wholly owned subsidiary of Recursion Pharmaceuticals, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SEQUENTIAL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

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 \[NSCLC\] * Prostate cancer * Ovarian cancer * Renal carcinoma \[clear and non-clear cell\] * Head and neck squamous cell carcinoma * Hepatic cancer * Gastric cancer * Triple-negative breast cancer \[TNBC\] * Participant disease should have progressed, relapsed or the participants should have been intolerant to at least one prior standard systemic therapy for their respective underlying malignancy. * Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1. Key

Exclusion criteria

* Any medical or psychiatric condition that, in the opinion of the Investigator, could jeopardize or would compromise the participant's safety or ability to participate in the study. * Symptomatic brain metastases, leptomeningeal metastases, or spinal cord compression due to disease. Participants with brain metastases must be clinically stable and off corticosteroids and anticonvulsants for ≥1 month prior to study treatment and not require any specific intervention for brain metastases. * Active and clinically significant infection requiring systemic antibacterial, antiviral, or antifungal therapy \<7 days of the first scheduled dose of the study treatment. * Significant cardiac abnormalities. * Major surgery within 28 days prior to the start of study treatment. Note: Other protocol-defined inclusion and

Design outcomes

Primary

MeasureTime frame
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 ModificationsUp to 3 years

Secondary

MeasureTime frame
Maximum Concentration (Cmax) of EXS74539Cycle 1 Day 25 and at end of treatment (up to approximately 3 years)
Time to Cmax (tmax) of EXS74539Cycle 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 EXS74539Cycle 1 Day 1 through end of treatment (up to approximately 3 years)
Objective Response Rate (ORR)Up to 3 years
Duration of Response (DoR)Up to 3 years
Progression-free Survival (PFS)Up to 3 years
Overall Survival (OS)Up to 3 years

Countries

United States

Contacts

CONTACTExscientia AI Ltd.
clinicaltrials@recursion.com385-374-1724

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jun 11, 2026