A Trial to Compare Treatment With Surlorian (ARM210, S48168) to Placebo in Effects on Muscle Strength and Safety in Adults With Autosomal Dominant RYR1-related Myopathy

A Phase 2, Randomized, Double-Blind, Placebo-Controlled Trial to Assess the Efficacy and Safety of Surlorian (ARM210, S48168) in Adults With Autosomal Dominant RYR1-Related Myopathy

This study is testing a medicine called surlorian in adults who have a genetic muscle condition known as autosomal dominant RYR1-related myopathy (RYR1-RM). The goal is to find out whether surlorian improves muscle weakness, and whether it is safe and well tolerated.

Study Overview

• Status: Not yet recruiting
• Conditions: Autosomal Dominant RYR1-Related Myopathy
• Intervention / Treatment: Drug: Surlorian; Other: Placebo

Detailed Description

The study is taking place at several medical centers with doctors who specialize in treating people with RYR1-RM. Everyone in the study will receive both surlorian and a placebo (a "dummy" treatment) at different times, but neither the participants nor the study staff will know which one they are getting during each period.

During Treatment period 1, participants will be randomly assigned to receive either surlorian or a placebo, which will be followed up by a washout period. Following the washout, in Treatment period 2, participants will switch and receive the opposite treatment from what they received in the first period. This main part of the study lasts about 16 weeks.

After finishing the main, placebo-controlled part of the study participants may be able to join an open-label extension lasting approximately 12 months. In this extension, everyone receives surlorian.

• Study Type: Interventional
• Enrollment (Estimated): 28
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Patrick Round; Phone Number: 888-209-5458; Email: clinicaltrials@rycarma.com

Study Locations

• France
  • Paris, France, 73013
    • Institut de Myologie - Hôpital de La Pitié-Salpétrière
  • Bouches-du-Rhône
    • Marseille, Bouches-du-Rhône, France, 13385
      • AP-HM- Hôpital de La Timone
• Germany
  • Baden-Wurttemberg
    • Ulm, Baden-Wurttemberg, Germany, 89081
      • Universitätsklinikum Ulm
  • State of Berlin
    • Berlin, State of Berlin, Germany, 13125
      • Charité - Campus Berlin Buch
• Netherlands
  • Gelderland
    • Nijmegen, Gelderland, Netherlands, 6500 HB
      • Radboud Universitair Medisch Centrum
• Spain
  • Barcelona
    • Barcelona, Barcelona, Spain, 8035
      • Hospital Universitario Vall d'Hebron - PPDS
  • Guipúzcoa
    • San Sebastián, Guipúzcoa, Spain, 20014
      • Hospital Universitario de Donostia
• United Kingdom
  • London, United Kingdom, WC1N 3BG
    • University College Hospital - PPDS
  • Shropshire
    • Oswestry, Shropshire, United Kingdom, SY10 7AG
      • The Robert Jones and Agnes Hunt Orthopaedic Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Can understand the written informed consent, provides signed and witnessed written informed consent, and agrees to comply with all protocol requirements
• Confirmed genetic diagnosis of RYR1-RM with autosomal dominant mutation
• Clinical evidence of weakness affecting any proximal muscle group(s) as assessed by the Investigator
• Can walk 10 m with or without a cane (no other walking aid allowed)
• Is either a female of non-childbearing potential or male or female, who agrees to use highly effective contraception/preventive exposure measures from the time of first dose of IP (for a male participant) or the signing of the informed consent form (ICF) (for a female participant) during the trial, and until 7 days after the last dose of IP.

Exclusion Criteria:

• Unable or unwilling to understand and comply with protocol requirements or unlikely to complete the study as planned, as judged by the Investigator
• Any clinically significant medical condition that, in the opinion of the Investigator, would interfere with the study
• Females who are pregnant, breastfeeding or intend to become pregnant, or of childbearing potential not using adequate contraceptive methods
• Participants with severe pulmonary dysfunction at screening, or evidence of pulmonary exacerbation (defined as an acute worsening of respiratory symptoms that result from a decline in lung function)
• Cardiac disease by history or at screening that, in the Investigator's opinion, is likely to worsen overall performance of efficacy measures during the study
• History of seizure disorder, neurologic disease, or neuromuscular disease other than RYR1-RM
• History of chronic orthopedic issues, acute injury, or expected surgery during the study that may affect the ability to complete study assessments
• Positive test results at screening for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg), or hepatitis C virus (HCV)
• Participants with screening alanine aminotransferase (ALT) levels >3 × upper limit of normal (ULN) or screening aspartate aminotransferase (AST) levels >5 × ULN (isolated elevations of total bilirubin <2 × ULN with direct bilirubin below the ULN will be included)
• History within the past year of alcohol or other drug substance abuse
• Known hypersensitivity to the investigational product of related compounds
• Treatment with statins, proton pump inhibitors or H2 blockers within 7 days or 5 half-lives, whichever is longer, prior to the first dose of the study drug
• Treatment with sensitive or narrow therapeutic index CYP3A4 substrates within 7 days or 5 half-lives, whichever is longer, prior to first dose of the study drug
• Treatment with strong or moderate CYP2C8 inhibitor or inducers within 7 days or 5 half-lives, whichever is longer, prior to the first dose of the study drug
• Currently enrolled in another study or received treatment with any other investigational drug within 30 days or > 5 half-lives, whichever is longer, prior to screening
• Has reported any suicide ideation of Category 4 or 5 on the C-SSRS within 6 months prior to screening or any suicidal behavior in the last two years prior to screening as indicated by any 'yes' answers on the suicidal behavior section of the C-SSRS

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Group A	Drug: Surlorian; 300 mg administered once a day; Other Names: ARM210 (S48168)
Placebo Comparator: Group B	Other: Placebo; administered once a day

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Change from baseline in the 1-minute sit-to-stand test (1-MSST)	Day 1 to day 28 [approximately]

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change from baseline in the 6-Minute Walk Test (6-MNWT)		Day 1 to day 28 [approximately]
Change from baseline in the Timed Up and Go Test (TUG)		Day 1 to day 28 [approximately]
Change from baseline in the 4-Stair Climb Test (4-SCT)		Day 1 to day 28 [approximately]
Change from baseline Quantitative Muscle Assessment (QMA)		Day 1 to day 28 [approximately]
Change from baseline Manual Muscle Testing (MMT)		Day 1 to day 28 [approximately]
Change from baseline in Patient-Reported Outcomes Measurement Information System-fatigue (PROMIS-F)		Day 1 to day 28 [approximately]
Change from baseline in Patient-Reported Outcomes Measurement Information System-physical fatigue (PROMIS-PF)		Day 1 to day 28 [approximately]
Chage in International Physical Activity Questionnaire (IPAQ)		Day 1 to day 28 [approximately]
Number of Adverse Events		Day 1 to end of study [approximately 68 weeks]
Change from baseline in systolic blood pressure	Systolic blood pressure will be measured in millimeters of mercury (mmHg)	Day 1 to end of study [approximately 68 weeks]
Change from baseline in diastolic blood pressure	Diastolic blood pressure will be measured in millimeters of mercury (mmHg)	Day 1 to end of study [approximately 68 weeks]
Change from baseline in temperature	Temperature will be measured in degrees Centigrade (°C)	Day 1 to end of study [approximately 68 weeks]
Change from baseline in hemoglobin	Hemoglobin concentration will be measured in grams per liter (g/L) using standard hematology laboratory methods	Day 1 to end of study [approximately 68 weeks]
Change from baseline in white blood cell count	White blood cell count will be measured in ×10⁹/L using standard hematology laboratory methods	Day 1 to end of study [approximately 68 weeks]
Change from baseline in platelet count	Platelet count will be measured in ×10⁹/L using standard hematology laboratory methods	Day 1 to end of study [approximately 68 weeks]
Change from baseline in serum creatinine	Serum creatinine will be measured in micromoles per liter (µmol/L) using standard clinical chemistry methods	Day 1 to end of study [approximately 68 weeks]
Change from baseline in estimated glomerular filtration rate	Estimated glomerular filtration rate (eGFR) will be calculated from serum creatinine using the Chronic Kidney Disease Epidemiology Collaboration equation	Day 1 to end of study [approximately 68 weeks]
Change from baseline in serum glucose	Serum glucose concentration will be measured in millimoles per liter (mmol/L) using standard clinical chemistry methods	Day 1 to end of study [approximately 68 weeks]
Change from baseline in QTc interval	Corrected QT interval (QTcF) will be measured in milliseconds using triplicate 12-lead electrocardiograms	Day 1 to end of study [approximately 68 weeks]
Change from baseline in urine protein	Urine protein will be measured in milligrams per liter (mg/L) using standard urinalysis methods	Day 1 to end of study [approximately 68 weeks]

Collaborators and Investigators

• Sponsor: RyCarma Therapeutics, Inc.

Study record dates

Study Major Dates

• Study Start (Estimated): April 15, 2026
• Primary Completion (Estimated): August 27, 2027
• Study Completion (Estimated): August 27, 2028

Study Registration Dates

• First Submitted: April 7, 2026
• First Submitted That Met QC Criteria: April 23, 2026
• First Posted (Actual): April 30, 2026

Study Record Updates

• Last Update Posted (Actual): April 30, 2026
• Last Update Submitted That Met QC Criteria: April 23, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: Adults; Interventional; Phase 2; RYR1-Related Myopathy; Surlorian; ARM210
• Other Study ID Numbers: CL2-210-02; 2025-522343-18-00 (Ctis)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No