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JNJ-78278343

Phase 1

Prostatic 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
CONTROLLEDBiomarker
Total Trials3
Total Enrollment711
FDA Designations
No designations recorded
Clinical Trials (3)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07082920A Study of JNJ-78278343 in Combination With JNJ-95298177 for Treatment of Prostate CancerPHASE1 RECRUITING 140Jul 7, 2025Mar 1, 2027Jun 5, 20266 United States, United Kingdom
NCT06095089A Study of JNJ-87189401 Combined With JNJ-78278343 for Advanced Prostate CancerPHASE1 RECRUITING 355Nov 1, 2023Jun 28, 2028Jun 5, 202615 United States, France +1
NCT04898634A Study of JNJ-78278343, a T-Cell-Redirecting Agent Targeting Human Kallikrein 2 (KLK2), for Advanced Prostate CancerPHASE1 ACTIVE NOT_RECRUITING 216Jul 13, 2021Feb 10, 2027Jun 5, 202617 United States, China +4
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Study Endpoints
Primary Endpoints
Number of Participants With Adverse Events (AEs) by Severity
Up to 2 years 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 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
Objective Response Rate (ORR)
Up to 2 years 2 months
Prostate-Specific Antigen (PSA) Response Rate
Up to 2 years 2 months
Radiographic Progression-Free Survival (rPFS)
Up to 2 years 2 months
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
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 2: Dose ExpansionEXPERIMENTALParticipants will receive JNJ-78278343 in combination with JNJ-95298177 at the RP2CD as determined in Part 1 of the study to confirm the safety and anti-tumor activity.
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-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
JNJ-78278343DRUGJNJ-78278343 will be administered intravenously.
JNJ-95298177DRUGJNJ-95298177 will be administered intravenously.
JNJ-87189401DRUGJNJ-87189401 will be administered.
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.
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Eligibility Criteria
Age Range18 Years — N/A
SexMALE
Healthy VolunteersNo
Study Sites6

Inclusion Criteria: * Histologically confirmed adenocarcinoma of the prostate. Primary small cell carcinoma, carcinoid tumor, neuroendocrine (NE) carcinoma, or large cell NE carcinoma arising in the prostate are not allowed; however, adenocarcinomas with NE features (for example \[e.g.\], immunohis...

Countries:United StatesUnited KingdomFranceJapanChinaNetherlandsSpain
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Recent Changes (Last 90 Days)
LOWJun 5, 2026NCT06095089lastUpdatePostDate: changed
LOWJun 5, 2026NCT07082920lastUpdatePostDate: changed
LOWJun 5, 2026NCT04898634lastUpdatePostDate: changed
LOWJun 5, 2026NCT06095089lastUpdatePostDate: changed
LOWJun 5, 2026NCT07082920lastUpdatePostDate: changed
LOWJun 5, 2026NCT04898634lastUpdatePostDate: changed
LOWJun 5, 2026NCT06095089lastUpdatePostDate: changed
LOWJun 5, 2026NCT07082920lastUpdatePostDate: changed
LOWJun 5, 2026NCT04898634lastUpdatePostDate: changed
LOWJun 5, 2026NCT06095089lastUpdatePostDate: changed
LOWJun 5, 2026NCT07082920lastUpdatePostDate: changed
LOWJun 5, 2026NCT04898634lastUpdatePostDate: changed
MEDIUMMay 26, 2026NCT06095089Enrollment: 250 → 355
LOWMay 26, 2026NCT07082920primaryCompletionDate: changed
MEDIUMMay 26, 2026NCT04898634primaryCompletionDate: changed
LOWMay 24, 2026NCT06095089studyFirstPostDate: changed
LOWMay 24, 2026NCT07082920studyFirstPostDate: changed
LOWMay 24, 2026NCT04898634studyFirstPostDate: changed