A First-in-human Study of RLY-8161 in Advanced NRAS-Mutant Solid Tumors

May 29, 2026 updated by: Relay Therapeutics, Inc.

A First-in-human Study of RLY-8161 for Treatment of Advanced NRAS-Mutant Melanoma and Other Solid Tumors

This is a Phase 1 first-in-human, open-label multicenter study designed to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics, and preliminary antitumor activity of RLY-8161, an NRAS-selective inhibitor, in participants with advanced NRAS-mutant melanoma and other solid tumors.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a Phase 1 first-in-human, open-label multicenter study designed to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics, and preliminary antitumor activity of RLY-8161, an NRAS-selective inhibitor, in participants with advanced NRAS-mutant melanoma and other solid tumors. This study consists of 2 parts: dose escalation (Part 1) and dose expansion (Part 2).

Part 1, dose escalation will explore multiple ascending doses of RLY-8161 in participants with any advanced NRAS-mutant solid tumor until maximum tolerated dose is reached or one or more recommended Phase 2 dose (RP2D) is identified.

Part 2, dose expansion will be at the RP2D(s) identified in Part 1 in NRAS-mutant solid tumors.

Study Type

Interventional

Enrollment (Estimated)

35

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • California
      • Los Angeles, California, United States, 90095
        • Recruiting
        • University of California, Los Angeles (UCLA) Department of Medicine
    • Massachusetts
      • Boston, Massachusetts, United States, 02114
        • Recruiting
        • Massachusetts General Hospital
    • Michigan
      • Grand Rapids, Michigan, United States, 49546
        • Recruiting
        • START Midwest, LLC
    • New York
      • New York, New York, United States, 10065
        • Recruiting
        • Memorial Sloan Kettering Cancer Center
    • Tennessee
      • Nashville, Tennessee, United States, 37203
        • Recruiting
        • Sarah Cannon Research Institute (SCRI) Oncology Partners
    • Virginia
      • Fairfax, Virginia, United States, 22031
        • Recruiting
        • NEXT Virginia

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1.
  • Histologically confirmed diagnosis of unresectable Stage III or IV melanoma or other solid tumor.
  • Disease is refractory to standard therapy (including targeted therapy), participant is intolerant of standard therapy, or participant has declined standard therapy.
  • Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1.
  • One or more documented primary oncogenic NRAS mutation(s).

Exclusion Criteria:

  • Known activating KRAS, HRAS, or BRAF mutation or known alterations in other driver oncogenes.
  • Prior treatment with ERK, MEK, RAF, or RAS targeting agents or any agent whose mechanism of action is to inhibit the RAS-MAPK pathway.
  • For participants with melanoma: lactate dehydrogenase (LDH) >2×ULN.
  • Central nervous system (CNS) metastases that are associated with progressive neurologic symptoms or require ongoing corticosteroids to control the CNS disease.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Part 1: RLY-8161 for participants with advanced NRAS-mutant solid tumors
Multiple doses of RLY-8161 for oral administration
Drug: RLY-8161
RLY-8161 is an NRAS-selective inhibitor
Experimental: Part 2: RLY-8161 for participants with advanced NRAS-mutant solid tumors
Oral doses of RLY-8161 as determined during Part 1 Dose Escalation
Drug: RLY-8161
RLY-8161 is an NRAS-selective inhibitor

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Part 1: Maximum Tolerated Dose (MTD) and/or RP2D of RLY-8161
Time Frame: Cycle 1 (28-day cycle) of treatment for MTD and at the end of every cycle (28-day cycle) for RP2D until treatment discontinuation, approximately 12 months
Cycle 1 (28-day cycle) of treatment for MTD and at the end of every cycle (28-day cycle) for RP2D until treatment discontinuation, approximately 12 months
Part 1: Number of participants with Adverse Events (AEs) or Serious Adverse Events (SAEs), with changes in vital signs, electrocardiograms (ECGs), and laboratory tests
Time Frame: Cycle 1 (28-day cycle) of treatment and at the end of every cycle (28-day cycle) until 30 days after treatment discontinuation, approximately 13 months
Cycle 1 (28-day cycle) of treatment and at the end of every cycle (28-day cycle) until 30 days after treatment discontinuation, approximately 13 months
Part 2: Objective Response Rate (ORR) of RLY-8161 as assessed by RECIST v1.1
Time Frame: Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months

Secondary Outcome Measures

Outcome Measure
Time Frame
Part 1 and Part 2: Changes in NRAS mutant allele fraction in ctDNA
Time Frame: Approximately every 2 weeks in Cycle 1 (28-day cycle), at the beginning of Cycle 2 (28-day cycle), and at the beginning of every odd cycle (28-day cycle) until End of Treatment (EOT), approximately 12 months
Approximately every 2 weeks in Cycle 1 (28-day cycle), at the beginning of Cycle 2 (28-day cycle), and at the beginning of every odd cycle (28-day cycle) until End of Treatment (EOT), approximately 12 months
Part 1 and Part 2: Plasma concentration and PK parameters of RLY-8161
Time Frame: Approximately every 2 weeks in Cycle 1 (28-day cycle) and at Day 1 of every cycle (28-day cycle) through Cycle 4
Approximately every 2 weeks in Cycle 1 (28-day cycle) and at Day 1 of every cycle (28-day cycle) through Cycle 4
Part 1: ORR of RLY-8161 as assessed by RECIST v1.1
Time Frame: Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Part 1 and 2: Duration of Response (DOR) of RLY-8161 as assessed by RECIST v1.1
Time Frame: Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Part 1 and 2: Disease Control Rate (DCR) of RLY-8161 as assessed by RECIST v1.1
Time Frame: Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Part 2: Progression-free survival (PFS) as assessed by RECIST v1.1
Time Frame: Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Approximately every 8 weeks on treatment and every 12 weeks after last dose in the absence of progressive disease, approximately 18 months
Part 2: Overall Survival
Time Frame: Cycle 1 (28-day cycles) until study completion, approximately 30 months
Cycle 1 (28-day cycles) until study completion, approximately 30 months
Part 2: Number of participants with AEs or SAEs, with changes in vital signs, ECGs, and laboratory tests
Time Frame: Cycle 1 (28-day cycle) of treatment and at the end of every cycle (28-day cycle) until 30 days after treatment discontinuation, approximately 13 months
Cycle 1 (28-day cycle) of treatment and at the end of every cycle (28-day cycle) until 30 days after treatment discontinuation, approximately 13 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Relay Therapeutics, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 9, 2026

Primary Completion (Estimated)

December 30, 2027

Study Completion (Estimated)

December 31, 2029

Study Registration Dates

First Submitted

April 28, 2026

First Submitted That Met QC Criteria

May 6, 2026

First Posted (Actual)

May 13, 2026

Study Record Updates

Last Update Posted (Actual)

June 2, 2026

Last Update Submitted That Met QC Criteria

May 29, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Other Study ID Numbers

  • RLY-8161-101

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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