Observational Study in Patients Treated With JAK Inhibitors for Inflammatory Rheumatism (MAJIK)

  • End date
    Jan 5, 2029
  • participants needed
  • sponsor
    Societe Francaise de Rhumatologie
Updated on 5 August 2021
rheumatic diseases
rheumatoid arthritis
psoriatic arthritis
biological drug


Janus kinase (JAK) inhibitors are a new class of molecules available to the therapeutic arsenal for chronic inflammatory rheumatic diseases.The tolerance profile of this new class needs to be better defined and its use in real life further established.

The French Society of Rheumatologists intends to coordinate a prospective national registry study for this follow-up.

This registry will include at least 1500 Rheumatoid Arthritis (RA) and 150 patients with psoriatic arthritis from the start of treatment with JAK inhibitor and then followed for 5 years.

This registry is a longitudinal, multicentre, observational registry study. The objective of this national registry is to get a better understanding of the safety profiles of JAK inhibitors and get knowledge of their use in daily practice in order to optimize this use and potentially integrate JAK inhibitors into personalised medicine strategies.

This registry will generate efficacy data, especially therapeutic maintenance, observation, allowing inter-registry comparisons with other biologic compounds in the French population, and can be aggregated with other similar registries in other countries.



This registry is a longitudinal, multicentre, observational registry study, with continuous and ambispective collection of clinical and laboratory data. The patients will be followed for 5 years, regardless of the therapeutic modifications occurring thereafter.

Target population:

Patients initiating JAK inhibitor therapy for inflammatory rheumatic disorder.

Number of patients and centres :

  • The objective is to include, per drug available on the market, at least 300 to 500 patients with RA and at least 100 to 150 patients with psoriatic arthritis. If a JAK inhibitor is approved in a new indication of chronic rheumatic disease by European Medicines Agency (EMA), the number of patients to include for each molecule in this indication will be adjusted as a function of the prevalence/epidemiology of each disease. Products currently available (baricitinib and tofacitinib) will be considered at the start of this registry; then every new indication for an already approved drug or every new drug in the same therapeutic class starting from the date they are placed on the market will be considered.
  • More than 80 centers in France (hospital-based, public and private practice) will participate.

Condition Arthritis, Rheumatic Fever, collagen disorders, Psoriasis and Psoriatic Disorders, inflammatory rheumatism, spondyloarthritis, Arthritis and Arthritic Pain, rheumatic disease, Rheumatism, Rheumatoid Arthritis, Arthritis and Arthritic Pain (Pediatric), Rheumatoid Arthritis (Pediatric), Psoriatic Arthritis, Connective Tissue Diseases, PSORIATIC ARTHRITIS, Spondyloarthropathy, CONNECTIVE TISSUE DISEASE, Dermatomyositis (Connective Tissue Disease), Psoriasis, inflammatory rheumatisms, Spondylarthritis
Treatment No intervention
Clinical Study IdentifierNCT04602091
SponsorSociete Francaise de Rhumatologie
Last Modified on5 August 2021


Yes No Not Sure

Inclusion Criteria

Patients older than 18
Patient treated with a JAK inhibitor in accordance with EMA, for chronic inflammatory rheumatisms, independent of the therapeutic line
Subject who is a member of a social security regime

Exclusion Criteria

Patient who cannot understand the implications and rules of the study
Patient opposition to participating in the study
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How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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