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RP1, intra-tumoral , oncolytic virus

Phase 1

Merkel Cell Carcinoma | Monoclonal antibody | Oncology |Replimune Group, Inc.|Last Updated: Apr 22, 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
UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment69
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04349436Study to Investigate the Efficacy and Safety of RP1 in Adult Patients With Organ Transplants and Advanced Skin MalignanciesPHASE1 ACTIVE NOT_RECRUITING 69May 15, 2020Nov 1, 2029Apr 22, 202624 United States
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Study Endpoints
Primary Endpoints
Primary Objective for Patients with Locally Advances CSCC (laCSCC)
36 months

The effect of RP1 on objective response rate (ORR) as assessed by Independnet Central Review (ICR) per Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1)

Primary Efficacy Objective for Patients with Other Skin Cancers
36 months

The effect of RP1 on ORR as assessed by investigator review per modified RECIST 1.1 (mRECIST 1.1)

Primary Safety Objective for Patients with Other Skin Cancers
36 months

The safety and tolerability of single-agent RP1 in solid organ transplant patients with other skin cancers as assessed by incidence of patients with treatment-emergent adverse events (TEAEs) and by incidence of patients with biopsy-proven allograft rejection.

Secondary Endpoints
Duration of Response (DOR) for Patients with laCSCC
36 months
Progression-Free Survival (PFS) for Patients with laCSCC
36 months
Disease Control Rate (DCR) for Patients with laCSCC
36 months
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
RP1, intra-tumoral injection, oncolytic virusEXPERIMENTALRP1 administered as an intra-tumoral injection every 2 weeks.
Interventions
NameTypeDescription
RP1, intra-tumoral injection, oncolytic virusBIOLOGICALGenetically modified herpes simplex type 1 virus
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites24

Key Inclusion Criteria: 1. Voluntary agreement to provide written informed consent prior to any study procedures and the willingness and ability to comply with all aspects of the protocol and understand the risk to their organ allograft. 2. Male or female at birth and at least 18 years of age prior...

Countries:United States
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Recent Changes (Last 90 Days)
HIGHMay 26, 2026NCT04349436Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 24, 2026NCT04349436studyFirstPostDate: changed