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Pasritamig

Phase 3

Metastatic Castration-resistant Prostatic Neoplasms | Monoclonal antibody | Oncology |Johnson & Johnson|Last Updated: Aug 28, 2026

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment1,203

FDA Designations

No designations recorded

Clinical trial landscape

Pasritamig · 4 trials · 5 indications

Phase 3 2Phase 1 2
NCT07225946A Study of Pasritamig With Docetaxel Versus Docetaxel in Participants With Metastatic Castration-Resistant Prostate CancerProstatic Neoplasms, Castration-Resistant
RECRUITING800 Analytics
NCT07164443A Study of Pasritamig With or Without JNJ-87189401 Versus Placebo for Late Line Metastatic Castration-resistant Prostate Cancer (mCRPC)Metastatic Castration-resistant Prostatic Neoplasms
RECRUITING1,203 Analytics
PHASE3RECRUITING
A Study of Pasritamig With Docetaxel Versus Docetaxel in Participants With Metastatic Castration-Resistant Prostate Cancer
Prostatic Neoplasms, Castration-ResistantUnlock trial analytics
PHASE3RECRUITING
A Study of Pasritamig With or Without JNJ-87189401 Versus Placebo for Late Line Metastatic Castration-resistant Prostate Cancer (mCRPC)
Metastatic Castration-resistant Prostatic NeoplasmsUnlock trial analytics

Study Endpoints

Primary Endpoints

Radiographic Progression-Free Survival (rPFS) by computed tomography (CT)/magnetic resonance imaging (MRI) or bone scan Assessed by Blinded Independent Central Review (BICR)
Up to approximately 1 years 10 months

rPFS by CT/MRI or bone scan is assessed by BICR and is defined as the time from the date of randomization to the first date of radiographic disease progression, or death due to any cause, whichever occurs first.

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.

Number of Participants With Adverse Events (AEs) by Severity
Up to 1 year 2 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. 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. Cytokine release syndrome (CRS) and immune effector cell associated neurotoxicity syndrome (ICANS) will be graded according to the American Society for Transplantation and Cellular Therapy (ASTCT) guidelines and ocular events will be graded using the alternative scale provided in the protocol.

Part 1: Number of Participants With Dose-Limiting Toxicity (DLT)
Up To Day 22

High grade hematologic or non-hematologic toxicities with exceptions and/or toxicities leading to treatment discontinuation will be regarded as DLT.

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

Overall Survival (OS)
Up to approximately 4 years 5 months
Time to Symptomatic Progression (TSP)
Up to approximately 4 years 5 months
Time to Subsequent Therapy (TST)
Up to approximately 4 years 5 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Pasritamig+DocetaxelEXPERIMENTALParticipants will receive pasritamig along with docetaxel until the end of treatment (EOT) visit or until radiographic disease progression is confirmed by blinded independent central review (BICR), or any other protocol defined criteria are met.
DocetaxelACTIVE_COMPARATORParticipants will receive docetaxel along with prednisone/prednisolone as background medication.
Part 1: Pasritamig+Best Supportive Care (BSC)EXPERIMENTALParticipants in Part 1 will receive 2 step-up doses of pasritamig intravenously (IV) followed by the target dose. 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.
Part 1: Placebo+BSCPLACEBO_COMPARATORParticipants in Part 1 will receive 2 step-up doses of placebo IV followed by the target dose. 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.
Part 2: Pasritamig+BSCEXPERIMENTALParticipants in Part 2 will receive 2 step-up doses of pasritamig IV followed by the target dose. 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.
Part 2: Pasritamig+JNJ-87189401+BSCEXPERIMENTALParticipants in Part 2 will receive 2 step-up doses of pasritamig IV followed by the target dose. JNJ-87189401 will be administered with the first target dose of pasritamig. 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.
Part 2: Placebo +BSCPLACEBO_COMPARATORParticipants in Part 2 will receive 2 step-up doses of placebo IV followed by the target dose. 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.
Part 1: Dose FindingEXPERIMENTALParticipants will receive pasritamig in combination with JNJ-86974680 to determine the recommended phase 2 combination dose (RP2CD) regimen.
Part 2: Dose ExpansionEXPERIMENTALParticipants will receive pasritamig in combination with JNJ-86974680 at the RP2CD as determined in Part 1 of the study to confirm the safety and anti-tumor activity.
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
PasritamigDRUGPasritamig will be administered.
DocetaxelDRUGDocetaxel will be administered.
Prednisone/PrednisoloneDRUGPrednisone/Prednisolone will be administered.
PlaceboOTHERPlacebo will be administrated through IV infusion.
Best Supportive Care (BSC)DRUGBSC will be administered at the discretion of the treating physician.
JNJ-87189401BIOLOGICALJNJ-87189401 will be administered.
JNJ-86974680DRUGJNJ-86974680 will be administered orally.
CetrelimabDRUGCetrelimab will be administered by intravenous infusion.
CabazitaxelDRUGCabazitaxel 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 to N/A
SexALL
Healthy VolunteersNo
Study Sites152

Inclusion criteria: * Have histologically confirmed adenocarcinoma of the prostate * Have disease that is metastatic at the time of screening by computed tomography (CT) or magnetic resonance imaging (MRI) and 99m\^Tc bone scan as determined by the investigator * Participants must receive ongoing a...

Countries:United StatesAustraliaBelgiumBrazilCanadaChinaFranceGermanyItalyJapanMalaysiaPuerto RicoSouth KoreaSpainTaiwanTurkey (Türkiye)United KingdomNetherlandsPoland
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Recent Changes (Last 90 Days)

LOWAug 28, 2026NCT05818683lastUpdatePostDate: changed
LOWAug 28, 2026NCT07225946lastUpdatePostDate: changed
LOWAug 28, 2026NCT07319871lastUpdatePostDate: changed
MEDIUMAug 28, 2026NCT07164443primaryCompletionDate: changed
LOWAug 28, 2026NCT05818683lastUpdatePostDate: changed
LOWAug 28, 2026NCT07319871lastUpdatePostDate: changed
MEDIUMAug 28, 2026NCT07164443primaryCompletionDate: changed
LOWAug 28, 2026NCT07225946lastUpdatePostDate: changed
MEDIUMAug 25, 2026NCT07164443lastUpdatePostDate: changed
MEDIUMAug 25, 2026NCT07164443lastUpdatePostDate: changed
LOWJul 31, 2026NCT07164443Enrollment: 663 → 1203
LOWJul 31, 2026NCT07164443Enrollment: 663 → 1203
MEDIUMJul 30, 2026NCT07225946lastUpdatePostDate: changed
MEDIUMJul 30, 2026NCT07225946lastUpdatePostDate: changed
MEDIUMJul 6, 2026NCT07164443Completion: 2027-12-29 → 2028-10-18
LOWJul 6, 2026NCT05818683lastUpdatePostDate: changed
LOWJul 6, 2026NCT07319871lastUpdatePostDate: changed
MEDIUMJul 6, 2026NCT07164443Completion: 2027-12-29 → 2028-10-18
LOWJul 6, 2026NCT05818683lastUpdatePostDate: changed
LOWJul 6, 2026NCT07319871lastUpdatePostDate: changed

Frequently asked questions about Pasritamig

What is Pasritamig used for?

Pasritamig is an investigational small molecule being developed for prostate cancer, including metastatic castration-resistant prostate cancer (mCRPC) and metastatic hormone-sensitive prostate cancer. It is being studied in combination with other agents and as part of treatment regimens for these advanced prostate cancer indications.

Who makes Pasritamig?

Pasritamig is being developed by Johnson & Johnson, a company traded on the New York Stock Exchange under the ticker JNJ. The drug is currently in clinical development for prostate cancer indications, with multiple trials ongoing.

What phase is Pasritamig in?

Pasritamig is in Phase 1 and Phase 3 clinical trials. It is an investigational drug, not yet approved by regulatory authorities. The Phase 3 trials are studying it in metastatic castration-resistant prostate cancer, while Phase 1 trials are exploring combinations for earlier-stage prostate cancer.

What clinical trials is Pasritamig in?

Pasritamig is being studied in four recruiting trials: NCT05818683, a Phase 1 combination study for metastatic prostate cancer; NCT07164443, a Phase 3 trial with or without JNJ-87189401 versus placebo for late-line mCRPC; NCT07225946, a Phase 3 trial with docetaxel for mCRPC; and NCT07319871, a Phase 1 combination study for prostate cancer.

Is Pasritamig the same as JNJ-78278343?

Yes, Pasritamig is also known as JNJ-78278343. Clinical trial titles refer to the drug by this alternative name, such as in the study of Pasritamig (JNJ-78278343) in combination with other agents for metastatic prostate cancer.