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INBRX-106

Phase 2

Head and Neck Squamous Cell Carcinoma (HNSCC) | Small molecule | Oncology |Inhibrx Biosciences, Inc.|Last Updated: May 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
RandomizedDouble-BlindACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment410
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06295731INBRX-106 in Combination With Pembrolizumab in First-line PD-L1 CPS≥20 HNSCCPHASE2 ACTIVE NOT_RECRUITING 410May 14, 2024May 1, 2029May 8, 202687 United States, Australia +11
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Study Endpoints
Primary Endpoints
Phase 2: Objective Response Rate (ORR)
up to 6 months

ORR is defined as the proportion of patients with a complete response (CR) or partial response (PR) on 2 consecutive occasions ≥4 weeks apart, per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)

Phase 3: Progression-Free Survival (PFS)
From randomization to first occurrence of progressive disease (PD) or death (up to 4 years)

PFS is defined as the time from randomization to first occurrence of PD, as determined by the Investigator according to RECIST v 1.1, or death from any cause (whichever occurs first).

Phase 3: Overall Survival (OS)
From randomization until death from any cause (up to 4 years)

OS is the time from randomization to death due to any cause

Secondary Endpoints
Phase 3: Objective Response Rate (ORR)
From randomization until treatment discontinuation (up to 2 years)
Duration of Response (DOR)
From the first occurrence of a documented objective response to PD or death (up to 4 years)
Clinical Benefit Rate (CBR)
From randomization until treatment discontinuation (up to 2 years)
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
INBRX-106 plus pembrolizumabEXPERIMENTALParticipants will receive INBRX-106 plus pembrolizumab, both given by intravenous (IV) infusion every 3 weeks (QW3)
pembrolizumab monotherapy (+ placebo in phase 3 part)ACTIVE_COMPARATORParticipants will receive pembrolizumab (plus placebo in Phase 3), given by intravenous (IV) infusion every 3 weeks (QW3)
Interventions
NameTypeDescription
INBRX-106DRUGINBRX-106 by intravenous (IV) infusion, given every 3 weeks (QW3)
PembrolizumabDRUGPembrolizumab 200 mg by intravenous (IV) infusion, given every 3 weeks (QW3)
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites87

Inclusion Criteria: * Has histologically or cytologically confirmed diagnosis of metastatic, recurrent head and neck squamous cell carcinoma (HNSCC) that is considered incurable by local therapies. * Has tumor PD-L1 expression of CPS ≥20. Tumor tissue must be provided for PD-L1 biomarker analysis. ...

Countries:United StatesAustraliaBelgiumBulgariaFranceItalyMalaysiaPolandRomaniaSouth KoreaSpainTaiwanUnited Kingdom
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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT06295731Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 24, 2026NCT06295731studyFirstPostDate: changed