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XmAb808

Phase 1

Head and Neck Squamous Cell Carcinoma | Monoclonal antibody | Oncology |Xencor, Inc.|Last Updated: Aug 7, 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
UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment60
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05585034Phase 1, First-in-human, Dose-finding and Expansion Study to Evaluate XmAb®808 in Combination With Pembrolizumab in Advanced Solid TumorsPHASE1 COMPLETED 60Dec 14, 2022May 20, 2025Aug 7, 202512 United States
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Study Endpoints
Primary Endpoints
Incidence of treatment-emergent adverse events (TEAEs)
Up to 5 years

Safety and tolerability as assessed by incidence of TEAEs, including clinically significant changes in safety laboratory tests and clinical findings

Incidence of dose-limiting toxicities (DLTs)
49 days

Safety and tolerability as assessed by incidence of DLTs and all available data which will be used to determine the optimal dose regimen

Secondary Endpoints
Measurement of Cmax
Through study completion, Up to 5 years
Measurement of AUCtau
Through study completion, Up to 5 years
Objective Response Rate
Through study completion, Up to 5 years
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Dose Escalation and Expansion XmAb®808 administered in combination with pembrolizumabEXPERIMENTALXmAb®808 in combination with pembrolizumab
Interventions
NameTypeDescription
XmAb®808BIOLOGICALMonoclonal bispecific antibody
Keytruda® (pembrolizumab)BIOLOGICALMonoclonal antibody
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites12

Key Inclusion Criteria: * Part A: Histologically confirmed advanced/metastatic castration-resistant prostate adenocarcinoma, epithelial ovarian cancer, head and neck squamous cell carcinoma, non-small cell lung cancer, urothelial carcinoma, melanoma, renal cell carcinoma, triple-negative breast can...

Countries:United States
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