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Pasritamig

Phase 3

Metastatic Castration-resistant Prostate Neoplasms | Small molecule | Oncology |Johnson & Johnson|Last Updated: Jun 5, 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-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment963
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07164443A Study of Pasritamig Versus Placebo in Late Line Metastatic Castration-resistant Prostate Cancer (mCRPC)PHASE3 RECRUITING 663Sep 2, 2025Dec 29, 2027Jun 5, 2026168 United States, Australia +15
NCT05818683A Study of Pasritamig (JNJ-78278343) in Combination With Other Agents for Metastatic Prostate CancerPHASE1 RECRUITING 300Apr 26, 2023May 23, 2028Jun 5, 202615 United States, Australia +1
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Study Endpoints
Primary Endpoints
Overall Survival (OS)
Up to 2 years and 8 months

OS is defined as the time from randomization to date of death due to any cause.

Part 1: Number of Participants With Dose Limiting Toxicity (DLT)
Up to 21 days after first dose of combination agent

DLTs are specific adverse events and are defined as any of the following: high grade non-hematologic toxicity or hematologic toxicity.

Part 1 and Part 2: Number of Participants with Adverse Events (AEs) by Severity
Up to 2 years 11 months

An AE is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study. Severity will be graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) version 5.0 with the exception of cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome events, which will be graded by American Society for Transplantation and Cellular Therapy (ASTCT) guidelines. Severity scale ranges from grade 1 (mild) to grade 5 (death). Grade 1= mild, Grade 2= moderate, Grade 3= severe, Grade 4= life-threatening and Grade 5= death related to adverse event.

Secondary Endpoints
Radiographic Progression-free Survival (rPFS)
Up to 2 years and 8 months
Time to Symptomatic Progression
Up to 2 years and 8 months
Time to Skeletal-Related Event
Up to 2 years and 8 months
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Pasritamig Plus Best Supportive Care (BSC)EXPERIMENTALParticipants will receive the step-up doses of pasritamig intravenously (IV) on Cycle 1 Day 1 (C1D1) and C1D8, and target dose of pasritamig IV on C1D15. From C2D1 onwards participants will receive pasritamig target dose IV every 6 weeks. All Cycles are 6 weeks, except for Cycle 1 which is 8 weeks. Participants will receive study treatment until confirmed progressive disease, death, intolerable toxicity, withdrawal of consent, or end of the study, whichever occurs first. All participants may receive BSC (defined as palliative external beam radiation, low dose steroids, pain medication, bone sparing agents, and needed palliative procedures) at the discretion of the physician.
Placebo Plus BSCPLACEBO_COMPARATORParticipants will receive the step-up doses of placebo IV on C1D1 and C1D8, and target dose of placebo on C1D15. From C2D1 onwards, participants will receive placebo target dose IV every 6 weeks. All Cycles are 6 weeks, except for Cycle 1 which is 8 weeks. Participants will receive study treatment until confirmed progressive disease, death, intolerable toxicity, withdrawal of consent, or end of the study, whichever occurs first. All participants may receive BSC at the discretion of the physician.
JNJ-78278343 + Combination agent: Part 1 (Dose Escalation) and Part 2 (Dose Expansion)EXPERIMENTALParticipants will receive pasritamig (JNJ-78278343) and combination agent (cetrelimab, cabazitaxel, docetaxel, apalutamide, enzalutamide, Darolutamide, abiraterone acetate plus prednisone, Lutetium Lu-177 vipivotide tetraxetan and JNJ-101556143) during Part 1 (dose escalation). The dose of pasritamig (JNJ-78278343) will be escalated sequentially until a recommended phase 2 regimen (RP2R). Participants will receive pasritamig (JNJ-78278343) and combination agent treatment at the putative RP2R in Part 2 (dose expansion).
Interventions
NameTypeDescription
PasritamigBIOLOGICALPasritamig will be administrated through IV infusion.
PlaceboOTHERPlacebo will be administrated through IV infusion.
Best Supportive Care (BSC)DRUGBSC will be administered at the discretion of the treating physician.
CetrelimabDRUGCetrelimab will be administered by intravenous infusion.
CabazitaxelDRUGCabazitaxel will be administered by intravenous infusion.
DocetaxelDRUGDocetaxel will be administered by intravenous infusion.
ApalutamideDRUGApalutamide will be administered orally.
EnzalutamideDRUGEnzalutamide will be administered orally.
DarolutamideDRUGDarolutamide will be administered orally.
Abiraterone acetate plus prednisone (AAP)DRUGAbiraterone acetate plus prednisone (AAP) will be administered orally.
Lutetium Lu-177 vipivotide tetraxetanDRUGLutetium Lu-177 vipivotide tetraxetan will be administered intravenously.
JNJ-101556143DRUGJNJ-101556143 will be administered orally.
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Eligibility Criteria
Age Range18 Years — N/A
SexMALE
Healthy VolunteersNo
Study Sites168

Inclusion Criteria * Histologically confirmed adenocarcinoma of the prostate * Metastatic castration-resistant prostate cancer (mCRPC): Disease that is metastatic either to bone, any lymph node, or both without clear evidence of other metastatic sites at the time of screening by conventional imagin...

Countries:United StatesAustraliaBelgiumBrazilCanadaChinaFranceGermanyItalyJapanNetherlandsPolandPuerto RicoSouth KoreaSpainTaiwanUnited Kingdom
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Recent Changes (Last 90 Days)
LOWJun 5, 2026NCT05818683lastUpdatePostDate: changed
LOWJun 5, 2026NCT07164443primaryCompletionDate: changed
LOWJun 5, 2026NCT05818683lastUpdatePostDate: changed
LOWJun 5, 2026NCT07164443primaryCompletionDate: changed
LOWJun 5, 2026NCT05818683lastUpdatePostDate: changed
LOWJun 5, 2026NCT07164443primaryCompletionDate: changed
LOWJun 5, 2026NCT05818683lastUpdatePostDate: changed
LOWJun 5, 2026NCT07164443primaryCompletionDate: changed
MEDIUMMay 26, 2026NCT07164443primaryCompletionDate: changed
MEDIUMMay 26, 2026NCT05818683Enrollment: 277 → 300
LOWMay 24, 2026NCT07164443studyFirstPostDate: changed
LOWMay 24, 2026NCT05818683studyFirstPostDate: changed