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First-in-Human Study of PLX-61639 in Locally Advanced or Metastatic Solid Tumors
Sponsor: Plexium, Inc.
Summary
A multicenter, single-arm, first-in-human study to investigate the safety, pharmacokinetics, and preliminary antitumor activity of PLX-61639 in participants with locally advanced or metastatic, relapsed/refractory, SMARCA4-deficient solid tumors who are intolerant of or have failed available, approved therapies. The study will be conducted in 3 parts: dose escalation (Part 1), dose optimization (Part 2), and cohort expansion (Part 3). Each part of the study will consist of a Screening Phase lasting up to 28 days during which participants will be assessed for eligibility, a Treatment Phase beginning on Cycle 1 Day 1 and consisting of consecutive 28-day cycles, an End of Treatment Visit, and a Post-Treatment Follow-Up Phase. Participants will receive their assigned dose of PLX-61639 administered orally, once daily until progression/relapse, intolerance, death, or withdrawal from study treatment by the Investigator or participant.
Official title: A Phase 1, First-in-Human Study of the SMARCA2 Degrader, PLX-61639, in Patients With SMARCA4-Mutated Locally Advanced or Metastatic Solid Tumors
Key Details
Gender
All
Age Range
18 Years - Any
Study Type
INTERVENTIONAL
Enrollment
155
Start Date
2025-12-01
Completion Date
2030-09
Last Updated
2026-03-24
Healthy Volunteers
No
Conditions
Interventions
PLX-61639
Orally available degrader of SMARCA2
Locations (10)
Research Site
Scottsdale, Arizona, United States
Research Site
Duarte, California, United States
Research Site
Orange, California, United States
Research Site
Boston, Massachusetts, United States
Research Site
St Louis, Missouri, United States
Research Site
New York, New York, United States
Research Site
Durham, North Carolina, United States
Research Site
Cleveland, Ohio, United States
Research Site
San Antonio, Texas, United States
Research Site
Fairfax, Virginia, United States