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BBI-940

Phase 1

Breast Cancer | Small molecule | Oncology |Boundless Bio, Inc.|Last Updated: Apr 13, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment96
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07408089Study of the Kinesin Oral Molecular Degrader BBI-940 in Subjects With Advanced or Metastatic Breast CancerPHASE1 RECRUITING 96Feb 25, 2026May 31, 2029Apr 13, 20268 United States
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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 — 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 408 trials
CompanyTickerTrialsLead PhaseDrugs
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib, Trastuzumab Deruxtecan, Paclitaxel, Trastuzumab
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy, Imlunestrant, Tamoxifen, Anastrozole
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1, Capecitabine, Paclitaxel, Nab-paclitaxel
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib, Alpelisib, Fulvestrant, Trastuzumab, Pertuzumab
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant, PF-07220060, letrozole, abemaciclib
BeOne Medicines Ltd. Sponsored ADRONC6PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib, Arm A: Gedatolisib + Palbociclib + Fulvestrant
Relay Therapeutics, Inc.RLAY2PHASE3RLY-2608, Capivasertib, Fulvestrant, Palbociclib, Ribociclib
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, Pembrolizumab, Axatilimab
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam, Alisertib, Endocrine therapy
Immutep Ltd Sponsored ADRIMMP1PHASE2eftilagimod alpha, Paclitaxel
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07408089primaryCompletionDate: changed
LOWMay 24, 2026NCT07408089studyFirstPostDate: changed