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

Design:

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.