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Study of the Kinesin Oral Molecular Degrader BBI-940 in Subjects With Advanced or Metastatic Breast Cancer

TerminatedPhase 1

Sponsor: Boundless Bio, Inc.

Conditions: Breast Cancer, Metastatic Breast Cancer, Advanced Breast Cancer

Interventions: BBI-940, Fulvestrant

Countries: United States

This is a first-in-human, open-label, Phase 1 study evaluating BBI-940, an investigational kinesin oral molecular degrader, administered as monotherapy or in combination with fulvestrant in adults with advanced or metastatic breast cancer.

Eligibility overview

Sex: ALL

Age: 18 Years to —

Healthy volunteers: No

Study type: INTERVENTIONAL

Eligibility criteria

Key Inclusion Criteria

* Adults with locally advanced or metastatic breast cancer, including estrogen receptor-positive/human epidermal growth factor receptor 2-negative (ER+/HER2-) disease or triple-negative breast cancer with luminal androgen receptor subtype (TNBC-LAR; androgen receptor expression ≥10% by immunohistochemistry), as applicable by study part.
* Prior treatment with standard therapies known to provide clinical benefit, appropriate for disease subtype and study part, including endocrine therapy with CDK4/6 inhibition for ER+/HER2- disease.
* Measurable disease per RECIST v1.1, except for participants enrolled in Part 1A.
* Molecular eligibility as applicable by study part, including absence of an ESR1 mutation (Part 2A) or presence of FGFR1 amplification (Part 2B), based on prior local testing.
* Availability of archival or newly obtained formalin-fixed, paraffin-embedded (FFPE) tumor tissue suitable for protocol-specified biomarker analyses.
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
* Adequate hematologic, hepatic, renal, and coagulation function per protocol-defined laboratory criteria.
* Estimated life expectancy of at least 12 weeks.
* Ability to swallow oral medication and provide written informed consent.

Key Exclusion Criteria

* Prior exposure to an inhibitor or degrader of Kinesin.
* Known hypersensitivity to study intervention(s) or excipients.
* Receipt of recent anticancer therapy within protocol-defined washout periods.
* Other active malignancy likely to interfere with study assessment.
* Baseline QTcF \>470 msec or congenital long QT syndrome.
* Clinically significant pulmonary embolism within 6 weeks prior to first dose.
* Major surgery within 4 weeks or minor surgery within 2 weeks prior to first dose.
* Active infection requiring systemic therapy within 2 weeks prior to first dose.
* Pregnant or breastfeeding, or planning conception or gamete donation during the study or required post-treatment period.
* Prior solid organ transplant or allogeneic stem cell transplant with protocol-defined exceptions.
* Failure to recover to CTCAE Grade ≤1 (or baseline) from prior anticancer therapy, with protocol-specified exceptions.
* Any serious or uncontrolled medical, laboratory, or psychiatric condition that could compromise safety or study integrity.
* Other exclusion criteria as specified in the study protocol.

Locations (8)

Los Angeles, California, United States
Lake Success, New York, United States
Austin, Texas, United States
Dallas, Texas, United States
Houston, Texas, United States
San Antonio, Texas, United States
San Antonio, Texas, United States
Fairfax, Virginia, United States