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BBO-10203

Phase 1

Solid Tumor, Adult | Small molecule | Oncology |BridgeBio Oncology Therapeutics, 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 Enrollment392
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06625775Open-Label Study of BBO-10203 in Subjects With Advanced Solid TumorsPHASE1 RECRUITING 392Oct 29, 2024Nov 1, 2028Apr 13, 202636 United States, Australia +2
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Study Endpoints
Primary Endpoints
Determination of maximum tolerated dose (MTD) and/or recommended Phase 2 dose (RP2D) of BBO-10203 as a single agent
Up to approximately 5 years
Percentage of patients with treatment-emergent adverse events (TEAEs), serious adverse events (SAEs), and dose-limiting toxicities (DLTs)
Up to approximately 5 years
Recommended BBO-10203 dose in combination with trastuzumab, fulvestrant +/- ribociclib, and FOLFOX + bevacizumab
Up to approximately 5 years
Secondary Endpoints
Clinical benefit rate (CBR) as assessed by RECIST v1.1.
Up to approximately 5 years
Duration of response (DOR) as assessed by RECIST v1.1.
Up to approximately 5 years
Progression-free survival (PFS) as assessed by RECIST v1.1
Up to approximately 5 years
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
BBO-10203EXPERIMENTALParticipants enrolled in this cohort will receive BBO-10203 tablets orally (different dose levels will be evaluated) once daily as monotherapy. This cohort will enroll patients with HER2-positive advanced breast cancer, HR-positive HER2-negative advanced breast cancer, advanced colorectal cancer, and advanced lung cancer.
BBO-10203 + TrastuzumabEXPERIMENTALParticipants enrolled in this cohort will receive BBO-10203 tablets orally in combination with trastuzumab. This cohort will enroll patients with HER2-positive advanced breast cancer.
BBO-10203 + FulvestrantEXPERIMENTALParticipants enrolled in this cohort will receive BBO-10203 tablets orally in combination with fulvestrant. This cohort will enroll patients with HR-positive, HER2-negative advanced breast cancer.
BBO10203 + Fulvestrant + RibociclibEXPERIMENTALParticipants enrolled in this cohort will receive BBO-10203 tablets orally in combination with fulvestrant and ribociclib as determined in the dose escalation. This cohort will enroll patients with HR-positive, HER2-negative advanced breast cancer.
BBO10203 + FOLFOX + BevacizumabEXPERIMENTALParticipants enrolled in this cohort will receive BBO-10203 tablets orally in combination with FOLFOX and bevacizumab. This cohort will enroll patients with KRAS-mutant advanced colorectal cancer.
Interventions
NameTypeDescription
BBO-10203DRUGParticipants will receive assigned dose of BBO-10203 orally once daily
TrastuzumabDRUGParticipants will receive trastuzumab as infusion or subcutaneous injection every 21 days
FulvestrantDRUGPatients will receive Fulvestrant as an intramuscular injection every 28 days (additional dose on C1D15)
RibociclibDRUGPatients will receive Ribociclib orally once a day (21 days on treatment, 7 days off)
FOLFOXDRUGPatients will receive FOLFOX as infusion every 14 days
BevacizumabDRUGPatients will receive bevacizumab as infusion every 28 days
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites36

Inclusion Criteria: * Locally advanced and unresectable or metastatic HER2-positive advanced breast cancer (aBC), HR-positive/HER2-negative advanced breast cancer, KRAS mutant advanced colorectal cancer (aCRC), or KRAS mutant advanced non-small cell lung cancer (aNSCLC) * Measurable disease by RECI...

Countries:United StatesAustraliaFranceSpain
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06625775primaryCompletionDate: changed
LOWMay 24, 2026NCT06625775studyFirstPostDate: changed