Not medical advice. This website is not medical advice, a diagnosis, a match to a trial, or a recommendation to join a study. Listings are plain-English rewrites of public ClinicalTrials.gov records. Whether a site is still enrolling, and whether you qualify, can only be confirmed by the study team and your clinician. Source registry: ClinicalTrials.gov. Editorial rules: methodology.
RecruitingPhase 1 / Phase 2interventionalRules rewrite

Phase 1 / Phase 2: testing STX-478 for Breast Cancer

Study STX-478-101 (LY4064809) is a multipart, open-label, phase 1/2 study evaluating the safety, tolerability, pharmacokinetics (PK), and preliminary antitumor activity of STX-478 (LY4064809) in participants with advanced solid tumors with P13Ka mutations. Part 1 will evaluate STX-478 as this drug alone in participants with advanced solid tumors.

Official registry: https://clinicaltrials.gov/study/NCT05768139 · Eli Lilly and Company · enrollment listed as 880

What this phase means

Phase 2: researchers already know a roughly safe dose (from phase 1). This stage asks whether the treatment actually helps the condition, and watches side effects more closely.

Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.

What the registry says happens

If you join, the listed intervention(s) are STX-478, Fulvestrant, or Ribociclib. The registry lists allocation as randomized. Study STX-478-101 (LY4064809) is a multipart, open-label, phase 1/2 study evaluating the safety, tolerability, pharmacokinetics (PK), and preliminary antitumor activity of STX-478 (LY4064809) in participants with advanced solid tumors with P13Ka mutations.

They plan to enroll about 880 people at 65 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.

Official title (unrewritten)

First-in-Human Study of STX-478, a Mutant-Selective PI3Kα Inhibitor as Monotherapy and in Combination With Other Antineoplastic Agents in Participants With Advanced Solid Tumors

Interventions: STX-478, Fulvestrant, Ribociclib, Palbociclib, Letrozole, Anastrozole, Exemestane, Tamoxifen, Abemaciclib, Imlunestrant, Metformin

Primary outcome (registry wording): Number of participants who experience at least 1 Dose Limiting Toxicity (DLT)

Who it is for (from inclusion criteria)

  • Ages 18 Years to any
  • Has an advanced or refractory solid tumor malignancy that is metastatic or locally advanced and unresectable (as specified by Cohort)
  • Has a new or recent tumor biopsy (collected at screening, if feasible) or will provide an adequate tissue sample prior to screening
  • Has a tumor that harbors a documented PI3Kα mutation (cohort specific criterion for cohort-specific mutation types)
  • Is ≥18 years of age at the time of signing the ICF
  • Has an how well you can do daily activities (ECOG score) score of 0 or 1 at screening
  • Has adequate organ function as defined per protocol

Public study contact (from the registry)

Trial questions or participation questions: 1-877-CTLILLY (1-877-285-4559) or

1-317-615-4559

LillyTrials@Lilly.com

Published on ClinicalTrials.gov. Contact them as a possible participant. They decide eligibility.

Sites listed on ClinicalTrials.gov

65 listed

+ 37 sites outside the US on the same record

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FAQ about this NCT record

Is NCT05768139 still recruiting?

The sponsor posted status “Recruiting” on ClinicalTrials.gov at last ingest. Sites can pause independently. Confirm with the official record and the listed contact.

What phase is NCT05768139?

Phase 1 / Phase 2. Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.

Can PlainTrials tell me if I qualify for NCT05768139?

No. The inclusion and exclusion lists on this page are readable extracts of the public eligibility block. Only the study team can screen you.

How to read a ClinicalTrials.gov record · Questions to ask the coordinator · Glossary