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INBRX-106 - Hexavalent OX40 agonist antibody

Phase 1

Solid Tumor | Small molecule | Oncology |Inhibrx Biosciences, Inc.|Last Updated: Dec 18, 2025

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
RandomizedACTIVE_CONTROLLEDBiomarker
Total Trials1
Total Enrollment296
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04198766Study of INBRX-106 and INBRX-106 in Combination With Pembrolizumab (Keytruda®) in Subjects With Locally Advanced or Metastatic Solid Tumors (Hexavalent OX40 Agonist)PHASE1 ACTIVE NOT_RECRUITING 296Dec 10, 2019May 12, 2027Dec 18, 202542 United States, Singapore +2
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Study Endpoints
Primary Endpoints
Frequency of adverse events of INBRX-106 as single agent and in combination with pembrolizumab
~2 years

Adverse events will be assessed by the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0

Severity of adverse events of INBRX-106 as single agent and in combination with pembrolizumab
~2 years

Adverse events will be assessed by the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0

MTD and/or RP2D of INBRX-106 as single agent and in combination with pembrolizumab
~2 years

Maximum Tolerated Dose (MTD) and/or Recommended Phase 2 Dose (RP2D) of INBRX-106 and INBRX-106 in combination with pembrolizumab

Antitumor activity of INBRX-106 in combination with pembrolizumab in expansion cohorts
~2 years

Tumor response will be determined by immune Response Evaluation Criteria in Solid Tumors (iRECIST).

Frequency and severity of adverse events of INBRX-106 in combination with pembrolizumab and chemotherapy in adults with locally advanced or metastatic NSCLC
~2 years

Adverse events will be assessed by the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0

Secondary Endpoints
Area under the serum concentration time curve (AUC) of INBRX-106
~2 years
Maximum observed serum concentration (Cmax) of INBRX-106
~2 years
Trough observed serum concentration (Ctrough) of INBRX-106
~2 years
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1 INBRX-106 Escalation (Not Recruiting)EXPERIMENTALINBRX-106 will be escalated in subjects with locally advanced or metastatic solid tumors.
Part 3 INBRX-106 Escalation in Combination with pembrolizumab (Not Recruiting)EXPERIMENTALINBRX-106 will be escalated, in combination with pembrolizumab, in subjects with locally advanced or metastatic solid tumors.
Part 2 (Cohorts C1/C2) INBRX-106 Escalation in Various Solid Tumor Types (Not Recruiting)EXPERIMENTALSubjects with melanoma (any type), head and neck squamous cell carcinoma, renal cell carcinoma, urothelial carcinoma or MSI/TMB-high tumors that are relapsed or refractory to prior checkpoint inhibitor (CPI) therapy will be treated with INBRX-106
Part 2 (Cohort C3) INBRX-106 Escalation in NSCLC (Not Recruiting)EXPERIMENTALSubjects with non-small cell carcinoma relapsed or refractory to prior checkpoint inhibitor (CPI) therapy will be treated with INBRX-106
Part 4 (Cohort F3a) INBRX-106 Expansion in Combination with pembrolizumab in NSCLC (Not Recruiting)EXPERIMENTALSubjects with non-small cell lung cancer will be treated with alternating dosing of INBRX-106 0.3 mg/kg Q6W and 400 mg pembrolizumab IV Q6W. This is one of the randomized cohorts.
Part 4 (Cohort F3b) INBRX-106 Expansion in Combination with pembrolizumab in NSCLC (Not Recruiting)EXPERIMENTALSubjects with non-small cell lung cancer will be given a 0.3 mg/kg priming dose of INBRX-106 in cycle 1, followed by 0.1 mg/kg INBRX-106 and 200 mg pembrolizumab IV every 3 weeks in subsequent cycles. This is one of the randomized cohorts.
Part 4 (Cohort F3c) Pembrolizumab Expansion Arm (Not Recruiting)ACTIVE_COMPARATORSubjects with non-small cell lung cancer will be treated with 200 mg pembrolizumab IV every 3 weeks. This is one of the randomized cohorts.
Part 4 (Cohort F3d) INBRX-106 Expansion in Combination with pembrolizumab in NSCLC (concurrent)EXPERIMENTALSubjects with non-small cell lung cancer will be treated concurrently every 6 weeks with INBRX-106 0.1 mg/kg and 200 mg pembrolizumab IV every 3 weeks. This is one of the randomized cohorts.
Part 4 (Cohort F4) INBRX-106 Expansion in Combination with pembrolizumabEXPERIMENTALSubjects with melanoma (any type), head and neck squamous cell carcinoma (non-nasopharyngeal) OR nasopharyngeal carcinoma, MSI-high, TMB-high or MMR-deficient tumors, will be treated with INBRX-106 in combination with 200mg pembrolizumab IV every 3 weeks. Only NPC is currently enrolling.
Part 4 (Cohort F5)INBRX-106 Expansion with pembrolizumab in MSI/TMB-high/MMRd tumors Not RecuritingEXPERIMENTALSubjects with solid tumors that have confirmed MSI-high, TMB-high or MMR-deficient states who are relapsed or refractory to checkpoint inhibitor (CPI) therapy will be treated with INBRX-106 and 200 mg pembrolizumab IV every 3 weeks
Part 4 (Cohort F6) INBRX-106 Expansion with pembrolizumab in Uveal Melanoma (Not Recruiting)EXPERIMENTALSubjects with ocular (uveal) melanoma who are relapsed or refractory to checkpoint inhibitor (CPI) therapy will be treated with INBRX-106 and 200 mg pembrolizumab IV every 3 weeks
Part 4 (Cohort F7a) INBRX-106 Expansion with pembrolizumab, pemetrexed and carboplatin in NSCLCEXPERIMENTALThis Arm is no longer recruiting. Subjects with advanced/metastatic NSCLC, any PD-L1 TPS will be treated with INBRX-106 0.1mg/kg, 200mg pembrolizumab, 500mg/m2 pemetrexed and carboplatin AUC-5 IV every 3 weeks
Part 4 (Cohort F7b) INBRX-106 Expansion with pembrolizumab, pemetrexed and cisplatin in NSCLCEXPERIMENTALThis Arm is no longer recruiting. Subjects with advanced/metastatic NSCLC, any PD-L1 TPS will be treated with INBRX-106 0.1mg/kg, 200mg pembrolizumab, 500mg/m2 pemetrexed and 75mg/m2 cisplatin IV every 3 weeks
Part 4(Cohort F7c)INBRX-106 Expansion with pembrolizumab, (Nab)-paclitaxel and carboplatin in NSCLCEXPERIMENTALThis Arm is no longer recruiting. Subjects with advanced/metastatic NSCLC, any PD-L1 TPS will be treated with INBRX-106 0.1mg/kg, 200mg pembrolizumab, 200mg/m2 paclitaxel and carboplatin AUC-6 IV every 3 weeks OR INBRX-106, 200mg pembrolizumab, 100mg/m2 nab-paclitaxel (dosed Days 1,8 and 15 every cycle) and carboplatin AUC-6 IV every 3 weeks. Treating physician to determine if paclitaxel or nab-paclitaxel will be given
Interventions
NameTypeDescription
INBRX-106 - Hexavalent OX40 agonist antibodyDRUGThe active ingredient of INBRX-106 is a recombinant, humanized, hexavalent IgG antibody that targets the human OX40 receptor (TNFRSF4).
pembrolizumab 200 mgDRUGpembrolizumab 200 mg by intravenous (IV) infusion, given on Day 1 of each 21-day cycle.
pembrolizumab 400 mgDRUGpembrolizumab 400 mg by IV infusion given on Day 1 of alternating 21-day cycles (every 6 weeks)
Carboplatin AUC-5DRUGcarboplatin AUC-5 by intravenous (IV) infusion, given on Day 1 of each 21-day cycle of cycles 1-4
Carboplatin AUC-6DRUGcarboplatin AUC-6 by intravenous (IV) infusion, given on Day 1 of each 21-day cycle of cycles 1-4
Pemetrexed 500 mg/m2DRUGpemetrexed 500 mg/m2 by IV infusion given on Day 1 of each 21-Day cycle for up to 35 cycles
Cisplatin 75mg/m2DRUGcisplatin 75mg/m2 by intravenous (IV) infusion, given on Day 1 of each 21-day cycle of cycles 1-4
Paclitaxel 200mg/m2DRUGpaclitaxel 200mg/m2 by intravenous (IV) infusion, given on Day 1 of each 21-day cycle of cycles 1-4
Nab paclitaxel 100mg/m2DRUGNab paclitaxel 100mg/m2 by intravenous (IV) infusion, given on Days 1, 8 and 15 of each 21-day cycle of cycles 1-4
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites42

Select Inclusion Criteria: * Males or females aged ≥18 years. * Parts 1 and 3 (escalation cohorts): Subjects with 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 ...

Countries:United StatesSingaporeSouth KoreaTaiwan
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT04198766primaryCompletionDate: changed
LOWMay 24, 2026NCT04198766studyFirstPostDate: changed