RecruitingPhase IEN original

First-in-Human Study of Mutant-selective PI3Kα Inhibitor, RLY-2608, as a Single Agent in Patients With Advanced Solid Tumors and in Combination With Endocrine Therapy +/- a CDK4/6 or CDK4 Inhibitor in Patients With Advanced Solid Tumors or Advanced Breast Cancer

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This is not medical advice. AI-assisted translation — inaccuracies may occur. Always verify the original and consult your oncologist before taking any steps.

About the trial

This is an open-label, FIH study designed to evaluate the maximum tolerated dose, recommended Phase 2 dose, safety, tolerability, PK, pharmacodynamics, and preliminary antineoplastic activity of RLY-2608, in advanced solid tumor patients with a Phosphatidylinositol-4,5-bisphosphate-3 kinase, catalytic subunit alpha (PIK3CA) mutation in blood and/or tumor per local assessment. The study will evaluate RLY-2608 as a single agent for patients with unresectable or metastatic solid tumors. It will also evaluate RLY-2608 in combination RLY-2608 + fulvestrant and in triple combination RLY-2608 + fulvestrant + CDK4/6 inhibitor (palbociclib or ribociclib) or CDK4 inhibitor (PF-07220060) for patients with HR+ HER2- locally advanced or metastatic breast cancer. The RLY-2608 single agent arm, RLY-2608 + fulvestrant combination arm, and triple combination arms will have 2 parts: a dose escalation (Part 1) and a dose expansion (Part 2).

Original English text from ClinicalTrials.gov

Who can (and can't) join

✓ Qualifies

  • Ogólny stan zdrowia pacjenta musi być dobry (skala 0-1)
  • Potwierdzona mutacja genu PIK3CA we krwi lub w guzie
  • Dostępna próbka tkanki guza lub zgoda na biopsję przed leczeniem
  • Guz, który nie poddaje się standardowemu leczeniu lub pacjent go nie toleruje
  • Potwierdzony rozległy lub przerzutujący nowotwór litego
  • Dla raka piersi: hormonowrażliwy (HR+) i bez nadekspresji HER2
  • Pacjent otrzymał co najmniej jeden inhibitor CDK4/6 wcześniej
  • Pacjent otrzymał co najmniej jedną terapię hormonalną wcześniej

Simplified criteria — AI translation

Trial details

Minimum age
18 Years
Last updated (source)
September 22, 2025
Sex
No restrictions

Therapies / drugs in trial

Locations (37)

The University of Arizona Cancer Center

Tucson, United States

University of California-San Diego

San Diego, United States

HealthONE

Denver, United States

Yale University

New Haven, United States

Florida Cancer Specialists

Orlando, United States

Boca Raton Clinical Research (BRCR) Global

Plantation, United States

University of Chicago Medical Center

Chicago, United States

Community Health Network

Indianapolis, United States

Massachusetts General Hospital

Boston, United States

Dana-Farber Cancer Institute

Boston, United States

University of Michigan

Ann Arbor, United States

Washington University School of Medicine St. Louis

St Louis, United States

Renown Regional Medical Center

Reno, United States

Rutgers University

New Brunswick, United States

NYU Langone

New York, United States

Columbia University Herbert Irving Comprehensive Cancer Center

New York, United States

Memorial Sloan Kettering

New York, United States

Tennessee Oncology

Nashville, United States

University of Texas Southwestern Medical Center

Dallas, United States

The University of Texas M.D. Anderson Cancer Center

Houston, United States

University of Utah- Huntsman Cancer Center

Salt Lake City, United States

Inova Schar Cancer Center

Fairfax, United States

NEXT Virginia

Fairfax, United States

UW Carbone Cancer Center

Madison, United States

St Vincents Hospital

Sydney, Australia

Peter MacCallum Cancer Center

Melbourne, Australia

The Alfred Hospital

Melbourne, Australia

Centre Léon Bérard

Lyon, France

Institute Bergonié

Bordeaux, France

Gustave Roussy

Villejuif, France

Istituto Europeo di Oncologia IRCCS

Milan, Italy

Vall d'Hebron Instituto de Oncologia

Barcelona, Spain

START Barcelona

Barcelona, Spain

Instituto Valenciano de Oncologia

Valencia, Spain

Institut Catala D'Oncologia - Badalona (ICO Badalona)

Barcelona, Spain

START Madrid - Hospital Fundacion Jimenez Diaz

Madrid, Spain

Hospital Universitario 12 de Octubre

Madrid, Spain

Trial contact

Contact information from ClinicalTrials.gov. Contact in English.

Data from ClinicalTrials.gov. AI-assisted translation, last sync: 7/1/2026.