Clinical trial Recruiting at 10 sites Phase 2 Interventional Ages 45 and up

Ruxolitinib for people with inclusion body myositis

Official title: Blocking Interferon-γ by Ruxolitinib for Treating Inclusion Body Myositis: a Phase IIb Trial

Run by Assistance Publique - Hôpitaux de Paris · NCT06536166 · Data updated 2026-11-12

This trial will test whether ruxolitinib can help improve walking distance, muscle strength, and breathing in adults 45 and older with inclusion body myositis.

More Inclusion Body Myositis trials

Quick facts

PhasePhase 2
Study typeInterventional
Ages45 Years and up
SexAll
Enrollment80 (estimated)
SponsorAssistance Publique - Hôpitaux de Paris
Academic / other
Drugs / interventionsruxolitinib
Locations21 sites (Angers, France and 20 other locations)
StatusRecruiting
StartedMay 27, 2025
Main results expectedJune 10, 2028
Study endsSeptember 10, 2028
Registry record updatedMay 29, 2026
Trial IDNCT06536166 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults aged 45 or older with biopsy-confirmed inclusion body myositis who can walk for at least six minutes (with or without assistive devices) and can give informed consent are ideal candidates.

Probably not a fit

People who are non-ambulatory, pregnant or breastfeeding, have significant cognitive impairment, or do not meet the biopsy-based diagnostic criteria are unlikely to benefit from participation.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a randomized, double-blind, placebo-controlled Phase 2 trial enrolling 60 participants with biopsy-proven inclusion body myositis who can walk for at least six minutes. Participants are randomized 1:1 to receive ruxolitinib 15 mg twice daily or placebo for 12 months, with regular clinic visits. Outcomes include the 6-minute walk test, quantitative muscle strength, functional scales, respiratory function tests, and muscle MRI. The trial is based on preclinical data showing a strong IFNγ/JAK-STAT signature in IBM muscle and that JAK inhibition can prevent IFNγ-related muscle suppression in models.

Why it matters

Potential benefit: If successful, ruxolitinib could slow muscle decline and improve mobility, strength, and quality of life for people with IBM.

How similar studies have gone: Preclinical studies and some early reports support JAK inhibition in IBM, but large randomized controlled evidence in IBM is currently limited, making this approach relatively novel in this disease.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Age ≥ 45 years
* Effective contraception for the duration of the clinical trial for fertile women of childbearing age
* Defined diagnosis of IBM according to data-derived criteria (Llyod et al, 2014): Patient must fulfill the three following criteria for being diagnosed as IBM: (1) finger flexor or quadriceps weakness; and (2) muscle biopsy showing endomysial inflammation; and (3) muscle biopsy showing invasion of nonnecrotic muscle fibers or rimmed vacuoles
* To be able to walk 6 min without assistance from another person (external assist devices permitted \[e.g., canes, walkers, or rollators\])
* Patient informed and having signed the consent for participation, possibly assisted by a trusted person

Exclusion Criteria:

* Pregnancy or breastfeeding
* Patient under guardianship, curatorship, safeguard of justice or deprived of liberty
* Patient with cognitive disorders or unable, according to the investigator, to understand the study and/or to give informed consent
* Quadriceps weakness (manual muscle testing, MRC) below or equal 1
* Forced vital capacity (FVC) or forced expiratory volume (FEV) \< 50% of predicted value
* Concomitant use of immunomodulatory drugs including previous treatment with JAK inhibitor, or medications acting on muscle anabolism or catabolism
* Live vaccine within the 4 weeks before starting treatment
* Comorbidity or active chronic disease which contraindicate ruxolitinib:

  * Lipid parameters abnormalities/elevations
  * Severe renal impairment (stage 4) and end-stage renal disease (stage 5)
  * Hepatic impairment
  * Cytopenia
  * Recent history (\<6 months) of cardiovascular or thromboembolic disease (documented coronaropathy or hospitalization for acute arterial thrombosis or stroke or deep venous thrombosis or pulmonary embolism)
  * Active smoking more than 20 pack-years or history of respiratory or skin cancer or recent history (\<6 months) of other neoplastic disease
  * Very high cardiovascular risk (red color) at SCORE 2 in case of recent history (\<6 months) of cardiovascular or thromboembolic disease and non-controlled cardiovascular risk factors
  * History of Stevens-Johnson's syndrome or Lyell's syndrome
* Active SARS-CoV-2 infection (patient can be included once infection resolved)
* Any medical condition which limits the ability of participant to participate in study
* Necessity to use a drug incompatible with ruxolitinib
* Hypersensitivity to the IMP's active substance (ruxolitinib) or to any of the excipients
* Non-affiliation to a social security scheme or to another social protection scheme, patient on state medical aid
* Foreseeable inability, according to the investigator, to participate in all the visits, treatments and measures provided for in the protocol
* Concomitant participation in another clinical trial on medical product for human use, to a clinical investigation on a medical device, to interventional study involving human participants or in the exclusion period at the end of a previous clinical trial on medical product for human use, a clinical investigation on a medical device, or study involving human participants.

Participation in non-interventional research is permitted.

Where it's running

  • CHU Caen Normandie
    Caen, France, France
    Recruiting
  • Hôpital Henri-Mondor, APHP
    Créteil, France, France
    Recruiting
  • Hôpital Roger Salengro, CHU de Lille
    Lille, France, France
    Recruiting
  • Hôpital Dupuytren, CHU de Limoges
    Limoges, France, France
    Recruiting
  • CHU Nancy
    Nancy, France, France
    Recruiting
  • Hôpital Pasteur, CHU de Nice
    Nice, France, France
    Recruiting
Show 15 more locations
  • Hôpital Pitié-Salpêtrière, APHP
    Paris, France, France
    Recruiting
  • Hôpital Christian Cabrol, CHU Reims
    Reims, France, France
    Recruiting
  • Hôpital Bellevue, CHU Saint-Etienne
    Saint-Etienne, France, France
    Recruiting
  • Hôpital Pierre-Paul Riquet, CHU de Toulouse
    Toulouse, France, France
    Recruiting
  • CHU d'Angers
    Angers, France, France
    Enrolling by invitation
  • Centre hospitalier de la Côte Basque
    Bayonne, France, France
    Enrolling by invitation
  • Hôpital CHU Jean Minjoz, CHU Besançon
    Besançon, France, France
    Enrolling by invitation
  • Hôpital Pellegrin - Tripode, CHU de Bordeaux
    Bordeaux, France, France
    Active not recruiting
  • Hôpital de la Cavale Blanche, CHU de Brest
    Brest, France, France
    Enrolling by invitation
  • Hôpital Pierre Wertheimer, CHU de Lyon
    Bron, France, France
    Active not recruiting
  • Hôpital Raymond Poincaré, APHP
    Garches, France, France
    Active not recruiting
  • Hôpital de la Timone, APHM
    Marseille, France, France
    Not yet recruiting
  • Hôpital Gui de Chauliac, CHU de Montpellier
    Montpellier, France, France
    Enrolling by invitation
  • Hôtel-Dieu, CHU Nantes
    Nantes, France, France
    Active not recruiting
  • Hôpital de Hautepierre, Hôpitaux Universitaires de Strasbourg
    Strasbourg, France, France
    Active not recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.