Evaluation of the Acceptability and Therapeutic Maintenance After Substitution of Ustekinumab With a Biosimilar

In a population of adult patients followed for Crohn's disease, who had previously agreed to replace Stelara® with a biosimilar of ustekinumab (Uzpruvo®) and were followed over a period of 12 months under usual medical practice conditions. * Main objective: To assess the maintenance of the biosimilar of ustekinumab at 12 months without returning to the reference treatment * Secondary objectives: * To describe the factors associated with the maintenance of the biosimilar * To evaluate the evolution of patients' quality of life * To assess the rate of maintenance of clinical remission at M12 * To describe the acceptability of the biosimilar treatment by patients * To evaluate patient satisfaction * To evaluate treatment tolerance * To describe the reasons for treatment discontinuation that occurred during follow-up * To describe the profile of patients who discontinued treatment upon their request.

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