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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

Target and mechanism

ModalityMonoclonal antibody

Also known as RP1, intra-tumoral injection, oncolytic virus, RP1

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment69

FDA Designations

ACCELERATED_APPROVALBREAKTHROUGH_THERAPYPRIORITY_REVIEW

Clinical trial landscape

RP1, intra-tumoral, oncolytic virus · 1 trial · 4 indications

Phase 1 1
NCT04349436Study to Investigate the Efficacy and Safety of RP1 in Adult Patients With Organ Transplants and Advanced Skin MalignanciesMerkel Cell Carcinoma
ACTIVE NOT_RECRUITING69 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study to Investigate the Efficacy and Safety of RP1 in Adult Patients With Organ Transplants and Advanced Skin Malignancies
Merkel Cell CarcinomaUnlock trial analytics

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 to 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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Frequently asked questions about RP1, intra-tumoral, oncolytic virus

What is RP1 used for?

RP1 is an investigational oncolytic virus being developed for the treatment of Non-Small Cell Lung Cancer (NSCLC) and Merkel Cell Carcinoma. It is administered via intra-tumoral injection and is currently in Phase 2 clinical development for these indications.

Who makes RP1?

RP1 is being developed by Replimune Group, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol REPL. The company is conducting clinical trials to evaluate RP1 as a monotherapy and in combination with other agents.

What phase is RP1 in?

RP1 is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. The drug has received FDA designations including Accelerated Approval, Breakthrough Therapy, and Priority Review, indicating its potential significance in oncology.

What clinical trials is RP1 in?

RP1 is being studied in two active clinical trials. NCT03767348 is a Phase 2 trial evaluating RP1 monotherapy and RP1 in combination with nivolumab in patients with NSCLC and other cancers. NCT04349436 is a Phase 1 trial investigating RP1 in organ transplant patients with advanced skin malignancies.

Is RP1 the same as RP1, intra-tumoral injection, oncolytic virus?

Yes, RP1 is also known as RP1, intra-tumoral injection, oncolytic virus. These alternative names describe the drug's administration route and mechanism as an oncolytic virus delivered directly into tumors.