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BBI-355

Phase 1

Triple Negative Breast Cancer (TNBC) | Small molecule | Oncology |Boundless Bio, Inc.|Last Updated: Jun 8, 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 Enrollment85
FDA Designations
No designations recorded
Trial Stopped -NCT05827614: Decision was made to halt the study based on overall clinical experience and market considerations. This decision was not driven by any safety signal.
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05827614Study of the CHK1 Inhibitor BBI-355, an ecDNA-directed Therapy (ecDTx), and the RNR Inhibitor BBI-825, in Subjects With Tumors With Oncogene AmplificationsPHASE1 TERMINATED 85Mar 24, 2023Mar 17, 2026Jun 8, 202616 United States
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Study Endpoints
Primary Endpoints
Frequency and severity of treatment emergent adverse events (TEAEs) of BBI-355 as a single agent and in combination with each of the following agents: erlotinib, futibatinib, or BBI-825
Start of Cycle 1 until 30 days following last dose (each cycle is 28 days)

TEAEs will be assessed and severity assigned by using the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0.

Maximum Tolerated Dose (MTD) and/or Recommended Phase 2 Dose (RP2D) of BBI-355 as a single agent and in combination with erlotinib, futibatinib, or BBI-825
Start of Cycle 1 until 30 days following last dose (each cycle is 28 days)

The MTD and/or RP2D of BBI-355 as a single agent and in combination with erlotinib, futibatinib, or BBI-825 will be determined.

Secondary Endpoints
Maximum observed plasma concentration (Cmax) of BBI-355, erlotinib, futibatinib, and BBI-825
Start of Cycle 1 until Day 1 of last treatment cycle (each cycle is 28 days)
Trough observed plasma concentration (Ctrough) of BBI-355, erlotinib, futibatinib, and BBI-825
Start of Cycle 1 until Day 1 of last treatment cycle (each cycle is 28 days)
Time to Cmax (Tmax) of BBI-355, erlotinib, futibatinib, and BBI-825
Start of Cycle 1 until Day 1 of last treatment cycle (each cycle is 28 days)
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Single Agent Dose EscalationEXPERIMENTALSingle agent BBI-355, administered orally in 28-day cycles
Single Agent Dose ExpansionEXPERIMENTALSingle agent BBI-355, administered orally in 28-day cycles
Dose Escalation in Combination with EGFR InhibitorEXPERIMENTALCombination therapy of BBI-355 and EGFR inhibitor erlotinib, administered orally in 28-day cycles.
Dose Escalation in Combination with FGFR InhibitorEXPERIMENTALCombination therapy of BBI-355 and FGFR1-4 inhibitor futibatinib, administered orally in 28-day cycles.
Dose Escalation in Combination with RNR InhibitorEXPERIMENTALCombination therapy of BBI-355 and RNR Inhibitor BBI-825, administered orally in 28-day cycles.
Interventions
NameTypeDescription
BBI-355DRUGOral CHK1 inhibitor
ErlotinibDRUGEGFR Inhibitor
FutibatinibDRUGFGFR1-4 Inhibitor
BBI-825DRUGOral RNR Inhibitor
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites16

Key Inclusion Criteria: * Locally advanced or metastatic non-resectable solid tumors, whose disease has progressed despite all standard therapies or for whom no further standard or clinically acceptable therapy exists, * Evidence of oncogene amplification, * Availability of FFPE tumor tissue, archi...

Countries:United States
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Recent Changes (Last 90 Days)
CRITICALJun 8, 2026NCT05827614Status: ACTIVE_NOT_RECRUITING → TERMINATED
CRITICALJun 8, 2026NCT05827614Status: ACTIVE_NOT_RECRUITING → TERMINATED
CRITICALJun 8, 2026NCT05827614Status: ACTIVE_NOT_RECRUITING → TERMINATED
LOWMay 26, 2026NCT05827614primaryCompletionDate: changed
LOWMay 24, 2026NCT05827614studyFirstPostDate: changed