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mRNA-4157

Phase 2

Melanoma | Small molecule | Oncology |Moderna, Inc.|Last Updated: Sep 3, 2026

Success Probability

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment267

FDA Designations

No designations recorded

Clinical trial landscape

mRNA-4157 · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT03897881An Efficacy Study of Adjuvant Treatment With the Personalized Cancer Vaccine mRNA-4157 and Pembrolizumab in Participants With High-Risk Melanoma (KEYNOTE-942)Melanoma
ACTIVE NOT_RECRUITING267 Analytics
PHASE2ACTIVE NOT_RECRUITING
An Efficacy Study of Adjuvant Treatment With the Personalized Cancer Vaccine mRNA-4157 and Pembrolizumab in Participants With High-Risk Melanoma (KEYNOTE-942)
MelanomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Recurrence-Free Survival (RFS), Assessed Using Radiological Imaging
Up to 7 years

RFS is defined as the time between the date of first dose of pembrolizumab and the date of recurrence (local, regional, or distant metastasis), new primary melanoma, or death (whatever the cause), whichever occurs first.

Number of Participants with Adverse Events
Part A and A2: Baseline through 100 days after last mRNA-4157 dose; Parts B, C, D, E1, E2, and E3: Baseline through 90 days after last pembrolizumab dose

Secondary Endpoints

Distant Metastasis-Free Survival (DMFS), Assessed Using Radiological Imaging
Up to 7 years
Number of Participants With Adverse Events (AEs)
Baseline through 100 days after last mRNA-4157 dose or up to 90 days after the last dose of pembrolizumab, whichever is later (for mRNA-4157 and Pembrolizumab combination arm) and up to 90 days after last pembrolizumab dose (for Pembrolizumab only arm)
Number of Participants Who Discontinued Due to AEs
Baseline through 100 days after last mRNA-4157 dose or up to 90 days after the last dose of pembrolizumab, whichever is later (for mRNA-4157 and Pembrolizumab combination arm) and up to 90 days after last pembrolizumab dose (for Pembrolizumab only arm)
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
mRNA-4157 and PembrolizumabEXPERIMENTALParticipants will receive up to 9 doses of mRNA-4157 (every 21 days). Participants may continue on pembrolizumab (every 21 days) until disease recurrence, unacceptable toxicity, or they undergo up to 18 total cycles (approximately 1 year of treatment), whichever is sooner.
PembrolizumabACTIVE_COMPARATORParticipants will receive pembrolizumab (every 21 days) until disease recurrence, unacceptable toxicity, or they undergo up to 18 total cycles (approximately 1 year of treatment), whichever is sooner.
Part A: Dose Escalation and Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via an intramuscular (IM) injection on Day 1 of each 21-day cycle for up to 9 cycles.
Part B: Dose Escalation and Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via an IM injection on Day 1 of each 21-day cycle for up to 9 cycles and pembrolizumab via IV infusion on Day 1 of each 21-day cycle until progression, unacceptable toxicity, or up to 35 cycles (approximately 2 years of treatment), whichever is sooner.
Part A2: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via an IM injection on Day 1 of each 21-day cycle and a SoC treatment every 2 weeks (Q2W) on Day 1 of each 21-day cycle starting from Cycle 5 of mRNA-4157 for up to 12 cycles.
Part C: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via IM injection on Day 1 of each 21-day cycle for up to 9 cycles and pembrolizumab via IV infusion on Day 1 of each 21-day cycle until progression, unacceptable toxicity, or up to 35 cycles (approximately 2 years of treatment), whichever is sooner.
Part D: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via IM injection on Day 1 of each 21-day cycle for up to 9 cycles and pembrolizumab via IV infusion on Day 1 of each 21-day cycle until progression, unacceptable toxicity, or up to 18 cycles (approximately 1 year of treatment), whichever is sooner.
Part E1: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via IM injection on Day 1 of each 21-day cycle, pembrolizumab every 6 weeks (Q6W) via IV infusion, and SoC chemotherapy every 3 weeks (Q3W) for up to 4 cycles during the perioperative and adjuvant phases.
Part E2: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via IM injection on Day 1 of each 21-day cycle, pembrolizumab Q6W via IV infusion, and SoC chemotherapy Q3W for up to 4 cycles during the perioperative and adjuvant phases.
Part E3: Dose ExpansionEXPERIMENTALParticipants will receive mRNA-4157 via IM injection on Day 1 of each 21-day cycle, pembrolizumab Q3W via IV infusion, and SoC chemotherapy Q2W or Q3W for up to 4 cycles during the perioperative and adjuvant phases.

Interventions

NameTypeDescription
mRNA-4157DRUGIndividualized Neoantigen Therapy
PembrolizumabBIOLOGICALIntravenous infusion
SoC TreatmentBIOLOGICALIntravenous infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites23

Key Inclusion Criteria: * Resectable cutaneous melanoma metastatic to a lymph node and at high risk of recurrence * Complete resection within 13 weeks prior to the first dose of pembrolizumab * Disease free at study entry (after surgery) with no loco-regional relapse or distant metastasis and no cl...

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

LOWSep 3, 2026NCT03313778lastUpdatePostDate: changed
LOWSep 3, 2026NCT03313778lastUpdatePostDate: changed

Frequently asked questions about mRNA-4157

What is mRNA-4157 used for?

mRNA-4157 is an investigational personalized cancer vaccine being studied for the treatment of melanoma and solid tumors. It is currently in clinical development, including a Phase 2 trial in high-risk melanoma. The drug is not yet approved by regulatory authorities.

What does mRNA-4157 target?

mRNA-4157 is a personalized cancer vaccine designed to target neoantigens specific to a patient's tumor. It is being studied alone and in combination with pembrolizumab in solid tumors and melanoma. The vaccine is intended to stimulate an immune response against the patient's cancer.

Who makes mRNA-4157?

mRNA-4157 is being developed by Moderna, Inc., a biotechnology company traded on the NASDAQ under the ticker symbol MRNA. Moderna is conducting clinical trials to evaluate the safety and efficacy of this personalized cancer vaccine in oncology indications.

What phase is mRNA-4157 in?

mRNA-4157 is in Phase 2 clinical development. A Phase 2 trial, KEYNOTE-942 (NCT03897881), is evaluating the vaccine in combination with pembrolizumab as adjuvant treatment in high-risk melanoma. An earlier Phase 1 trial (NCT03313778) has also been completed.

What clinical trials is mRNA-4157 in?

mRNA-4157 is being studied in two clinical trials. NCT03313778 is a Phase 1 trial in solid tumors, and NCT03897881 (KEYNOTE-942) is a Phase 2 trial in melanoma. Both trials are active but not recruiting participants, with a combined enrollment of over 400 patients.

Is mRNA-4157 the same as a personalized cancer vaccine?

Yes, mRNA-4157 is a personalized cancer vaccine. It is designed to be tailored to each patient's tumor mutations. The vaccine is being tested as a monotherapy and in combination with pembrolizumab for the treatment of solid tumors and melanoma.