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RP1

Phase 2

Non-Small Cell Lung Cancer (NSCLC) | Monoclonal antibody | Oncology |Replimune Group, Inc.|Last Updated: Feb 13, 2026

Target and mechanism

ModalityMonoclonal antibody

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

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment340

FDA Designations

ACCELERATED_APPROVALBREAKTHROUGH_THERAPYPRIORITY_REVIEW

Clinical trial landscape

RP1 · 1 trial · 4 indications

Phase 2 1
NCT03767348Study of RP1 Monotherapy and RP1 in Combination With Nivolumab (IGNYTE)Non-Small Cell Lung Cancer (NSCLC)
ACTIVE NOT_RECRUITING340 Analytics
PHASE2ACTIVE NOT_RECRUITING
Study of RP1 Monotherapy and RP1 in Combination With Nivolumab (IGNYTE)
Non-Small Cell Lung Cancer (NSCLC)Unlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of adverse events (AEs)
26 months

Percentage of subjects with adverse events (AEs)

Percentage of serious adverse events (SAEs)
26 months

Percentage of subjects with serious adverse events (SAEs)

Percentage of dose limiting toxicities (DLTs)
26 months

Percentage of subjects with dose limiting toxicities (DLTs)

Percentage of overall response rate (ORR)
26 months

Percentage of overall response rate (ORR) for all participants

Maximum tolerated dose (MTD) and recommended Phase 2 dose (RP2D) of RP1
20 weeks

Assess the maximum tolerated dose (MTD) and recommended Phase 2 dose (RP2D) of RP1 based on the safety and response data collected during Phase 1 Escalation

Secondary Endpoints

Percentage of biologic activity
20 weeks
Percentage subjects with detectable RP1
20 weeks
Percentage of complete response (CR)
26 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose escalation of RP1 by intratumoral (IT) injection in superficial tumorsEXPERIMENTALanti-PD-1 monoclonal antibody
Dose escalation of RP1 by intratumoral (IT) injection in deep/visceral tumorsEXPERIMENTALDose escalation of RP1 alone in 3 cohorts with IT injections in superficial tumors
Dose expansion of RP1 and nivolumab (IV) in superficial tumorsEXPERIMENTALDose escalation of RP1 alone in 3 cohorts with IT injections in superficial tumors
Dose expansion of RP1 and nivolumab (IV) in deep/visceral tumorsEXPERIMENTALDoses of RP1 (IT) in deep/visceral tumors with nivolumab (IV)
RP1 (IT) and nivolumab (IV) in melanomaEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with melanoma
RP1 (IT) and nivolumab (IV) in MSI-H/dMMR solid tumorsEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with MSI-H or dMMR solid tumors
RP1 (IT) and nivolumab (IV) in NMSCEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with non-melanoma skin cancer
RP1(IT) and nivolumab (IV) in anti-PD1 Failed Cutaneous MelanomaEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with cutaneous melanoma who have been previously treated with anti-PD1 therapy
RP1(IT) and nivolumab (IV) in anti-PD1/PD-L1 Failed NMSCEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with non-melanoma skin cancer who have been previously treated with anti-PD1/PD-L1 therapy
RP1(IT) and nivolumab (IV) in anti-PD1/PD-L1 Failed NSCLCEXPERIMENTALDoses of RP1 (IT) in superficial or deep tumors with nivolumab (IV) in subjects with non small cell lung cancer who have been previously treated with anti-PD1/PD-L1 therapy

Interventions

NameTypeDescription
RP1BIOLOGICALGenetically modified herpes simplex type 1 virus
nivolumabBIOLOGICALanti-PD-1 monoclonal antibody
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites51

Key Inclusion Criteria: * Have an Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0-1. * At least one measurable and injectable lesion * Have provided a former tumor pathology specimen or be willing to supply a new tumor sample from a biopsy * Have a predicted life expectancy of ≥...

Countries:United StatesFranceGermanySpainUnited Kingdom
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Recent Changes (Last 90 Days)

MEDIUMMay 26, 2026NCT03767348primaryCompletionDate: changed
LOWMay 24, 2026NCT03767348studyFirstPostDate: changed

Frequently asked questions about RP1

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.

How does RP1 work?

RP1 is an oncolytic virus designed to selectively replicate in and destroy tumor cells while also stimulating an anti-tumor immune response. It is administered directly into tumors via intra-tumoral injection, potentially enhancing its local and systemic anti-cancer effects.

Who is developing RP1?

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

What phase is RP1 in?

RP1 is currently in Phase 2 clinical development. It has received FDA designations including Accelerated Approval, Breakthrough Therapy, and Priority Review, indicating its potential to address serious conditions. The drug remains investigational and has not yet been approved for commercial use.

What clinical trials is RP1 in?

RP1 is being studied in the IGNYTE trial (NCT03767348), a Phase 2 study evaluating RP1 as monotherapy and in combination with nivolumab in patients with Non-Small Cell Lung Cancer, Microsatellite Instability-High tumors, Non-melanoma Skin Cancer, and Cutaneous Melanoma. Another trial (NCT04349436) is investigating RP1 in organ transplant patients with advanced skin malignancies.

Is RP1 the same as RP1 intra-tumoral injection?

Yes, RP1 is the same as RP1 intra-tumoral injection. The drug is administered via intra-tumoral injection, and this route of administration is part of its name. RP1 is an oncolytic virus being developed by Replimune Group for the treatment of various cancers.