A Study to Investigate the Safety, Pharmacokinetics, and Preliminary Efficacy of IDE574 Therapy in Adult Participants With Advanced Solid Tumors

Recruiting now · Phase 1

Conditions studied: ER+, HER 2- Breast Cancer, Non-small Cell Lung Cancer (NSCLC), Castration-resistant Prostate Cancer (CRPC), Microsatellite Stable (MSS) Colorectal Carcinoma

In brief

IDE574 is a synthetically manufactured small molecule inhibitor that co-targets the lysine acetyltransferase enzymes KAT6 and KAT7. The purpose of this study is to evaluate the safety, preliminary efficacy, pharmacokinetics (PK), and pharmacodynamics (PD) of IDE574 as monotherapy in participants with locally advanced or metastatic solid tumors and as combination therapy with fulvestrant in participants with advanced or metastatic ER+, HER2- breast cancer.

Key facts

Study ID

NCT07540572

Run by

IDEAYA Biosciences

People needed

160

Starts

2026-03-17

Expected to finish

2030-06-30

Last updated by the study team

2026-06-16

Who can join

Age: 18 and older, up to 99. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Archival Tissue sample for testing
• Part 1A - Participants with advanced or metastatic ER+, HER2- breast cancer, NSCLC, CRPC, and MSS colorectal adenocarcinoma who have progressed on/after at least one line of standard of care therapy or are intolerant to additional effective therapies.
• Parts 1B, 2A and 2B: Participants with ER+, HER2- breast cancer who have progressed after at least 1 prior line of treatment with an endocrine therapy and a CDK4/6 inhibitor
• Female participants with ER+, HER2- breast cancer considered to be of childbearing potential (or have tubal ligations only) must be willing to undergo medically induced menopause (Parts 2A and B only)
• Female participants of nonchildbearing potential with ER+, HER2- breast cancer must meet at least 1 of the following criteria: Age ≥ 60 years or age <60 years with absence of menstruation for at least 12 months, or had prior removal of both ovaries
• Have Eastern Cooperative Oncology Group performance status (ECOG PS) of ≤1.
• Have adequate bone marrow, renal and liver function.
• Life expectancy of >3 months
• Able to safely administer and retain orally administered study treatment
• Able to comply with contraceptive/barrier requirements
• Key Exclusion Criteria:
• Known symptomatic brain metastases or leptomeningeal metastasis
• Known primary CNS malignancy and any other malignancies within 2 years prior to the first dose with the exception of adequately treated localized tumor.
• Have impairment of GI function or GI disease that may significantly alter the absorption of IDE574.
• Have active liver or biliary disease.
• Have active, uncontrolled bacterial, fungal, or viral infection
• Have clinically significant cardiac abnormalities and/or blood clotting events within 6 months before the first dose
• If participants had adverse reactions to previous experimental antitumor treatment that have not recovered to Grade ≤ 1
• Prior irradiation to >25% of the bone marrow.
• Known or suspected hypersensitivity to IDE574/excipients or components (Parts 1 \& 2) or fulvestrant/excipients or components (Part 2 only)

Where it is running

• Florida Clinical Trials Group — Plantation, Florida, United States (enrolling)
• START Astera, LLC — East Brunswick, New Jersey, United States (enrolling)
• START New York Long Island, LLC — Lake Success, New York, United States (enrolling)
• NEXT Texas LLC - Austin — Austin, Texas, United States (enrolling)
• NEXT Texas LLC - Dallas — Dallas, Texas, United States (enrolling)
• START Dallas Fort Worth, LLC — Fort Worth, Texas, United States (enrolling)
• NEXT Texas LLC - Houston — Houston, Texas, United States (enrolling)
• NEXT Texas LLC - San Antonio — San Antonio, Texas, United States (enrolling)
• Start San Antonio, LLC — San Antonio, Texas, United States (enrolling)
• START Mountain Region, LLC — West Valley City, Utah, United States (enrolling)
• NEXT Virginia — Fairfax, Virginia, United States (enrolling)

Full record on ClinicalTrials.gov

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