Phase 1 Breast Cancer Trial, Recruiting NCT07408089 Sponsor: Boundless Bio, Inc. Condition: Breast Cancer
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Phase 1 Breast Cancer Trial, Recruiting

NCT07408089
Recruiting Phase 1

Who may be able to join

AI generated eligibility summary. Written by an AI model from the official source data and checked on a sample basis. It can contain mistakes, so confirm anything important against the original source. How we use AI

Who might be able to join this trial:

  • You are an adult with advanced or spreading breast cancer that is either estrogen receptor-positive/HER2-negative (ER+/HER2-), or a specific type of triple-negative breast cancer that tests positive for androgen receptors (at least 10% by a lab test), depending on which part of the study you are enrolling in.
  • You have already received standard treatments for your type of breast cancer, which for ER+/HER2- disease includes hormone therapy combined with a CDK4/6 inhibitor.
  • Your cancer can be measured on scans according to standard criteria (called RECIST v1.1), unless you are joining a specific early part of the study (Part 1A).
  • Depending on which part of the study you join, your tumor may need to show either the absence of a specific gene change called an ESR1 mutation (Part 2A), or the presence of a specific gene change called FGFR1 amplification (Part 2B), based on previous testing.
  • You are able to provide a stored or newly collected tumor tissue sample for testing as required by the study.
  • You are generally well enough to carry out light activity and care for yourself — scored 0 or 1 on a standard health scale called ECOG.
  • Your blood counts, liver, kidney, and clotting functions are within acceptable levels based on lab tests.
  • Your doctors estimate you have a life expectancy of at least 12 weeks.
  • You are able to swallow tablets or capsules and are willing and able to give written consent to take part.

Who may not be able to join:

  • You have previously been treated with a drug that targets or breaks down a protein called Kinesin.
  • You have a known allergy or sensitivity to any of the study drugs or their ingredients.
  • You have received cancer treatment too recently (within specific time periods set out by the study).
  • You have another active cancer that could affect how the study results are assessed.
  • You have a certain type of heart rhythm abnormality — specifically a QTcF measurement greater than 470 milliseconds on a heart tracing, or a condition called congenital long QT syndrome.
  • You have had a significant blood clot in the lungs within the 6 weeks before starting the study.
  • You have had major surgery within the last 4 weeks, or minor surgery within the last 2 weeks before starting the study.
  • You have an active infection that requires treatment with medicines given by injection or drip (systemic therapy) within 2 weeks before starting the study.
  • You are pregnant, breastfeeding, or planning to become pregnant, father a child, or donate eggs or sperm during the study or for a required period after treatment ends.
  • You have previously had an organ transplant or a bone marrow transplant from a donor, with some possible exceptions (confirm with trial site).
  • You are still experiencing side effects from previous cancer treatment that have not recovered to a mild or baseline level, with some specific exceptions (confirm with trial site).
  • You have any serious or uncontrolled medical, mental health, or laboratory condition that could affect your safety or the reliability of the study results.
  • There may be additional reasons you cannot join as set out in the full study document (confirm with trial site).

Important: Always verify eligibility with the trial site directly before applying.

Based on publicly available eligibility criteria from ClinicalTrials.gov. Verify directly with the trial site before acting. This is not medical advice.

This is a simplified plain English summary of the eligibility criteria. Full criteria are set by the trial investigators and may include additional requirements not shown here. Never self-exclude from a trial based on this summary. Contact the trial site directly to confirm your eligibility.
Last synced 30 June 2026
Phase 1: approximately ~10% of drugs entering this phase reach regulatory approval, based on published industry-wide historical data. This is not specific to this trial.
Phase success rates shown are historical industry-wide averages based on published data. They are not a prediction for this specific trial or your individual situation.

GP referral letter

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Trial details

Status
Recruiting
Phase
Phase 1
Sponsor
Boundless Bio, Inc.
Registry
ClinicalTrials.gov
Start date
25 February 2026
Est. completion
28 February 2029

Where this trial is recruiting

🇺🇸 United States

Primary endpoints

Rate of dose limiting toxicities (DLTs) in each BBI-940 monotherapy dose escalation cohort.; Incidence of treatment emergent adverse events (TEAEs) in each dose group and overall as assessed by CTCAE version 5.0.; Incidence of study treatment discontinuation and/or interruption by dose group and overall.

Can't join this trial?

Expanded access pathways

If this trial is not available to you, other access pathways may exist. In Australia, the TGA Special Access Scheme allows access to unapproved therapeutic goods for individual patients.

TGA Special Access Scheme information

Find other recruiting trials on ClinicalTrials.gov

Data last synced from ClinicalTrials.gov: 30 June 2026. Trial status can change. Always verify current status directly with the trial site before making any decision.

Trial recruitment status can change without notice between our nightly data updates. Always contact the trial site directly to confirm current recruitment status before making any decisions or travel arrangements.

View original record on ClinicalTrials.gov