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Petosemtamab

Phase 3

Head and Neck Squamous Cell Carcinoma | Small molecule | Oncology |Merus N.V.|Last Updated: Jun 3, 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
RandomizedACTIVE_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment1,300
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06525220A Phase 3 Study to Evaluate Petosemtamab Plus Pembrolizumab vs Pembrolizumab in First-line Treatment of Head and Neck Cancer (LiGeR - HN1)PHASE3 RECRUITING 700Sep 25, 2024Jul 1, 2030Jun 2, 2026205 United States, Argentina +26
NCT06496178A Phase 3 Study to Evaluate Petosemtamab Compared With Investigator's Choice Monotherapy in Previously Treated Head and Neck Squamous Cell Carcinoma Patients (LiGeR-HN2)PHASE3 RECRUITING 600Jun 25, 2024Mar 1, 2029Jun 3, 2026216 United States, Argentina +22
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Study Endpoints
Primary Endpoints
Overall Survival (OS)
Up to approximately 3 years
Objective Response Rate (ORR) per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 as assessed by blinded independent central review (BICR)
Up to approximately 2 years
Secondary Endpoints
Progression Free Survival (PFS) per RECIST v1.1 as assessed by BICR
Up to approximately 2 years
Duration of Response (DOR) per RECIST v1.1 as assessed by BICR
Up to approximately 2 years
Clinical benefit rate per RECIST v1.1 as assessed by BICR
Up to approximately 2 years
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Petosemtamab + PembrolizumabEXPERIMENTALCombination Therapy
PembrolizumabACTIVE_COMPARATORMonotherapy
MCLA-158EXPERIMENTAL -
Investigator's ChoiceACTIVE_COMPARATOR -
Interventions
NameTypeDescription
PetosemtamabDRUGMCLA-158
PembrolizumabDRUGHumanized Antibody
Investigator's ChoiceDRUGCetuximab
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites205

Inclusion Criteria: 1. Signed ICF before initiation of any study procedures 2. Age ≥ 18 years at signing of ICF 3. Histologically confirmed HNSCC with evidence of metastatic or locally recurrent disease not amenable to local therapy with curative intent. 4. The eligible HNSCC primary tumor location...

Countries:United StatesArgentinaAustraliaBelgiumBrazilCanadaChileCroatiaCzechiaFranceGermanyGreeceHungaryIsraelItalyJapanLithuaniaMalaysiaMexicoNetherlandsPolandPortugalSouth KoreaSpainTaiwanThailandTurkey (Türkiye)United KingdomSwitzerland
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Recent Changes (Last 90 Days)
LOWJun 3, 2026NCT06496178lastUpdatePostDate: changed
LOWJun 3, 2026NCT06496178lastUpdatePostDate: changed
LOWJun 2, 2026NCT06525220lastUpdatePostDate: changed
LOWJun 2, 2026NCT06525220lastUpdatePostDate: changed
LOWJun 2, 2026NCT06525220lastUpdatePostDate: changed
LOWMay 26, 2026NCT06496178Enrollment: 500 → 600
LOWMay 26, 2026NCT06525220primaryCompletionDate: changed
LOWMay 24, 2026NCT06496178studyFirstPostDate: changed
LOWMay 24, 2026NCT06525220studyFirstPostDate: changed