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BBI-940

Phase 1

Breast Cancer | Small molecule | Oncology |Boundless Bio, Inc.|Last Updated: Aug 19, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment96

FDA Designations

No designations recorded
Trial Stopped -NCT07408089: The study was terminated primarily due to a business decision related to a corporate transaction and was not driven by any safety signal.

Clinical trial landscape

BBI-940 · 1 trial · 3 indications

Phase 1 1
NCT07408089Study of the Kinesin Oral Molecular Degrader BBI-940 in Subjects With Advanced or Metastatic Breast CancerBreast Cancer
TERMINATED8 Analytics
PHASE1TERMINATED
Study of the Kinesin Oral Molecular Degrader BBI-940 in Subjects With Advanced or Metastatic Breast Cancer
Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Rate of dose limiting toxicities (DLTs) in each BBI-940 monotherapy dose escalation cohort.
First 28 days of study treatment (through end of Cycle 1).

DLTs will be assessed during the first 28 days of study treatment (Cycle 1) to establish the maximum tolerated dose (MTD) and the recommended dose for expansion (RDE) of BBI-940 as monotherapy.

Incidence of treatment emergent adverse events (TEAEs) in each dose group and overall as assessed by CTCAE version 5.0.
First dose of study treatment through 30 days after the last dose of study treatment.

Incidence of treatment emergent adverse events (TEAEs) will be assessed by maximum severity and maximum causality.

Incidence of study treatment discontinuation and/or interruption by dose group and overall.
First dose of study treatment through 30 days after the last dose of study treatment.

The incidence of study treatment discontinuation and/or interruption will be assessed.

Secondary Endpoints

Objective response rate (ORR) per RECIST Version 1.1 by dose group and overall.
From first dose of study treatment until disease progression per RECIST 1.1, death, withdrawal, loss to follow-up, or study completion; tumor assessments every 8 weeks (±7 days); assessed up to approximately 3 years.
Progression Free Survival (PFS) per RECIST Version 1.1 by dose group and overall.
From first dose of study treatment until first documented disease progression per RECIST 1.1 or death from any cause, whichever occurs first; tumor assessments every 8 weeks (±7 days); assessed up to approximately 3 years.
Time of maximum plasma concentration (Tmax) of BBI-940.
From 0 hours through up to 24 hours after BBI-940 dosing.
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Parts 1A, 1B. BBI-940 Monotherapy EscalationEXPERIMENTALParticipants receive BBI-940 given alone in multiple sequential dose escalation cohorts. BBI-940 is given orally in repeated 28-day cycles.
Part 2A. BBI-940 in Combination with Fulvestrant (ER+/HER2- Breast Cancer without an ESR1 Mutation)EXPERIMENTALParticipants receive BBI-940 in combination with fulvestrant. BBI-940 is given orally in repeated 28-day cycles at one of multiple potential dose levels.
Part 2B. BBI-940 Monotherapy Expansion (ER+/HER2- Breast Cancer with FGFR1 Amplification)EXPERIMENTALParticipants receive BBI-940 given alone at the recommended dose for expansion (RDE). BBI-940 is given orally in repeated 28-day cycles.
Part 2C. BBI-940 Monotherapy Expansion (TNBC-LAR)EXPERIMENTALParticipants receive BBI-940 given alone at the recommended dose for expansion (RDE). BBI-940 is given orally in repeated 28-day cycles.

Interventions

NameTypeDescription
BBI-940DRUGOral small molecule degrader targeting Kinesin.
FulvestrantDRUGSelective estrogen receptor degrader administered intramuscularly.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites8

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 expressi...

Countries:United States
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Competitive Landscape -Breast Cancer 402 trials

Top 20 of 92 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant
BeOne Medicines Ltd. Sponsored ADRONC5PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib
Relay Therapeutics, Inc.RLAY2PHASE3Zovegalisib, Capivasertib, Fulvestrant
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX2PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam
Atossa Therapeutics, Inc.ATOS1PHASE2endoxifen, goserelin
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Recent Changes (Last 90 Days)

LOWAug 20, 2026NCT07408089lastUpdatePostDate: changed
LOWAug 20, 2026NCT07408089lastUpdatePostDate: changed
LOWAug 20, 2026NCT07408089lastUpdatePostDate: changed
LOWAug 20, 2026NCT07408089lastUpdatePostDate: changed
CRITICALAug 4, 2026NCT07408089Status: RECRUITING → TERMINATED
CRITICALAug 4, 2026NCT07408089Status: RECRUITING → TERMINATED

Frequently asked questions about BBI-940

What is BBI-940 used for in breast cancer?

BBI-940 is an investigational small molecule being studied for the treatment of advanced or metastatic breast cancer. It is a kinesin oral molecular degrader, and it is currently in Phase 1 clinical development. The drug is not approved and remains under investigation for this oncology indication.

What does BBI-940 target?

BBI-940 is a kinesin oral molecular degrader. It targets kinesin proteins, which are motor proteins involved in cell division. By degrading these proteins, the drug aims to disrupt cancer cell proliferation. This mechanism is being evaluated in the context of advanced or metastatic breast cancer.

Who makes BBI-940?

BBI-940 is being developed by Boundless Bio, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol BOLD. The company is conducting clinical research on this investigational drug for the treatment of breast cancer.

What phase is BBI-940 in?

BBI-940 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The Phase 1 trial is designed to evaluate the drug in subjects with advanced or metastatic breast cancer.

What clinical trials is BBI-940 in?

BBI-940 is being studied in a Phase 1 clinical trial registered as NCT07408089. The trial is titled "Study of the Kinesin Oral Molecular Degrader BBI-940 in Subjects With Advanced or Metastatic Breast Cancer." It was conducted in the United States and enrolled 8 participants, though the trial status is listed as terminated.