International Treatment-extension Study in Adult Participants With Multiple Myeloma and Who Have Derived Clinical Benefit From Isatuximab

Inclusion Criteria: * Participant must be ≥18 years of age (or the legal age of consent in the jurisdiction in which the study is taking place), at the time of signing the informed consent. * Participants of a parental Phase 1, 2, or 3 clinical study assessing isatuximab monotherapy or in a combination regimen with all the study objectives completed. * Participants still receiving isatuximab at the time of the parental study closure, who are continuing to benefit from isatuximab as monotherapy or in combination, as determined by the treating physician, and who meet the criteria to initiate a subsequent cycle of therapy as described in the parental study protocol. A participant not receiving isatuximab at the end of the parental study who does not have access locally to the ongoing treatment may also be included. * Contraception (with double contraception methods) for male and female participants; not pregnant or breastfeeding for female participants; no sperm donation for male participants. * Capable of giving signed informed consent. Exclusion Criteria: * Participant has evidence of progressive disease during or at the time of the parental study closure. * Participant has not recovered to ≤Grade 2 from nonhematologic AEs (as per NCI CTCAE v5.0) related to any anticancer therapy received prior to signing informed consent on the extension study. * As the latest line of treatment participant received an antimyeloma therapy other than the isatuximab-based therapy in the paren…