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Pasritamig

Phase 3

Metastatic Castration-resistant Prostatic Neoplasms | Monoclonal antibody | Oncology |Johnson & Johnson|Trials Updated: Oct 6, 2026

Pasritamig development status

Highest phase Phase 3
Registered trials 10 across 3 sponsors since Nov 2020

Pasritamig target and mechanism

ModalityMonoclonal antibody

Also known as JNJ-78278343, KLK2-CD3

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials8
Total Enrollment3,072

FDA Designations

No designations recorded

Pasritamig clinical trials

Pasritamig · 8 trials · 6 indications

Phase 3 2Phase 1 6
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.

Feasibility of neoadjuvant pasritamig
From first dose through radical prostatectomy, approximately 70 days

Proportion of participants who complete planned neoadjuvant pasritamig and undergo radical prostatectomy within the protocol-defined surgical window without treatment-related delay.

Change in intratumoral CD3+ T-cell density
Baseline to radical prostatectomy, approximately 70 days

Measured as CD3-positive T cells per mm² of evaluable tumor area

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.

Parts 1, 2C, 3 and 4: Number of Participants With Dose Limiting Toxicity (DLT)
Up to 21 days after first combination dose of study drugs

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

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.

Part 1 and 2: Number of Participants With Adverse Events (AEs)
Up to 1 year and 10 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.

Part 1 and 2: Number of Participants With AEs by Severity
Up to 1 year and 10 months

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.

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.
Neoadjuvant PasritamigEXPERIMENTALParticipants receive pasritamig IV on days 1, 8, 15, and 57. Participants then undergo standard of care radical prostatectomy. Participants also undergo blood and tissue sample collection on study.
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.
Part 1: Dose ConfirmationEXPERIMENTALParticipants will receive JNJ-78278343 in combination with JNJ-95298177 in a dose de-escalation schedule in accordance with the Bayesian Optimal Interval Design (BOIN) design to determine the recommended phase 2 combination dose (RP2CD) regimen.
Part 1 (Dose Escalation)EXPERIMENTALParticipants will receive JNJ-78278343 + JNJ-87189401 escalated sequentially in Part 1 to select a recommended Phase 2 regimen (RP2R).
Part 2 (Dose Expansion)EXPERIMENTALParticipants with different disease settings in Parts 2A and 2B will receive JNJ-78278343+JNJ-87189401 at the RP2R selected in Part 1. Participants in Part 2C will receive apalutamide plus continued treatment with JNJ-87189401+JNJ-78278343 doublet.
Part 3EXPERIMENTALParticipants will receive JNJ-78278343 + JNJ-87189401 at one or more RP2R (s) selected in Part 1 along with standard of care (SOC) treatment with lutetium Lu-177 vipivotide tetraxetan. Dosing of JNJ-78278343+JNJ-87189401 will be escalated sequentially, as per study evaluation team (SET) decision.
Part 4EXPERIMENTALParticipants will receive JNJ-78278343 + JNJ-87189401 at one or more RP2R (s) along with JNJ-101556143. Dosing of JNJ-78278343+JNJ-87189401 along with JNJ-101556143 will be escalated sequentially to determine the RP2R of the combinations.
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).
JNJ-78278343EXPERIMENTALParticipants will receive JNJ-78278343. The dose levels will be escalated based on the dose limiting toxicities (DLT) evaluation by the study evaluation team (SET) in Part 1 (dose escalation). In Part 2 (dose expansion), participants will receive JNJ-78278343 at recommended phase 2 dose (RP2D) as determined in Part 1. Participants who are still on study treatment (i.e., who are in Treatment Phase) at the time of the long term extension (LTE) will continue to receive study treatment until they reach a reason for discontinuation of treatment or until further notification by the sponsor of a different means for continued supply of study treatment, whichever occurs first.

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.
JNJ-78278343DRUGJNJ-78278343 will be administered intravenously.
JNJ-95298177DRUGJNJ-95298177 will be administered intravenously.
ApalutamideDRUGApalutamide will be administered.
Lutetium Lu-177 Vipivotide TetraxetanDRUGLutetium Lu-177 Vipivotide Tetraxetan will be administered as SOC treatment.
JNJ-101556143DRUGJNJ-101556143 will be administered.
CetrelimabDRUGCetrelimab will be administered by intravenous infusion.
CabazitaxelDRUGCabazitaxel will be administered by intravenous infusion.
EnzalutamideDRUGEnzalutamide will be administered orally.
DarolutamideDRUGDarolutamide will be administered orally.
Abiraterone acetate plus prednisone (AAP)DRUGAbiraterone acetate plus prednisone (AAP) will be administered orally.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites158

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)

LOWOct 6, 2026NCT07860255NEW_TRIAL: changed
LOWOct 6, 2026NCT07860255NEW_TRIAL: changed
LOWSep 28, 2026NCT06095089lastUpdatePostDate: changed
LOWSep 28, 2026NCT06095089lastUpdatePostDate: changed
LOWSep 25, 2026NCT07082920lastUpdatePostDate: changed
LOWSep 25, 2026NCT07319871lastUpdatePostDate: changed
LOWSep 25, 2026NCT05818683lastUpdatePostDate: changed
MEDIUMSep 25, 2026NCT07225946Completion: 2029-07-20 → 2030-06-07
LOWSep 25, 2026NCT07164443lastUpdatePostDate: changed
LOWSep 25, 2026NCT07082920lastUpdatePostDate: changed
MEDIUMSep 25, 2026NCT07225946Completion: 2029-07-20 → 2030-06-07
LOWSep 25, 2026NCT07164443lastUpdatePostDate: changed
LOWSep 25, 2026NCT07319871lastUpdatePostDate: changed
LOWSep 25, 2026NCT05818683lastUpdatePostDate: changed
MEDIUMAug 28, 2026NCT07082920primaryCompletionDate: changed
LOWAug 28, 2026NCT07319871lastUpdatePostDate: changed
LOWAug 28, 2026NCT05818683lastUpdatePostDate: changed
LOWAug 28, 2026NCT06095089lastUpdatePostDate: changed
MEDIUMAug 28, 2026NCT07164443primaryCompletionDate: changed
LOWAug 28, 2026NCT07225946lastUpdatePostDate: changed

Frequently asked questions about Pasritamig

What is Pasritamig?

Pasritamig is an investigational small molecule being developed by Johnson & Johnson for prostate cancer. It is in clinical development for prostate cancer, including metastatic castration-resistant prostate cancer and localized prostate cancer. It has not been approved by the FDA and remains under study in clinical trials.

What is Pasritamig used for in prostate cancer?

Pasritamig is being studied for the treatment of prostate cancer, including metastatic castration-resistant prostate cancer and localized prostate cancer. It is an investigational therapy and is not approved for any indication. Clinical trials are evaluating it both as a single agent and in combination with other agents.

Who makes Pasritamig?

Pasritamig is developed by Johnson & Johnson, which trades under the ticker JNJ. The company is sponsoring the clinical development program for the drug across multiple prostate cancer studies.

What phase is Pasritamig in?

Pasritamig is in Phase 1 and Phase 3 clinical development. The Phase 3 program includes a study in metastatic castration-resistant prostate cancer, while Phase 1 studies are evaluating the drug in localized prostate cancer and in combination with other agents.

What clinical trials is Pasritamig in?

Pasritamig is being evaluated in several clinical trials, including NCT07225946, a Phase 3 study with docetaxel versus docetaxel in metastatic castration-resistant prostate cancer, and NCT07164443, a Phase 3 study in late-line metastatic castration-resistant prostate cancer. Phase 1 trials include NCT07860255 and NCT07319871.

Is Pasritamig the same as JNJ-78278343?

Yes, Pasritamig is also known as JNJ-78278343. This alternative designation appears in the title of a Phase 1 combination study, NCT07319871, which evaluates Pasritamig (JNJ-78278343) with JNJ-86974680 for the treatment of prostate cancer.