Multiple Myeloma (MM) is often associated with progression, temporary response to therapy and a high relapse rate over time resulting in a poor long-term prognosis. Because MM is classified as an incurable disease, therapeutic resistance is of great interest. However, knowledge about the biological mechanisms underlying resistance associated with MM therapies and about associated predictors remains poor. The MYRACLE cohort, a multicenter prospective cohort of patients with MM, is set up to address this limitation.