The following criteria is provided for health care professionals.

Age ≥18 years

* Patients with RRMM who have at least one prior line of therapy
* Patients for whom the treating physician has made the decision to initiate isatuximab per routine practice and independently of the purpose of the study; for retrospectively enrolled patients, exposure to isatuximab treatment for a maximum of three months prior to study enrollment
* Able to understand and complete the study-related questionnaires
* Patient must have given signed informed consent prior to study start. For retrospectively enrolled patients who are deceased at the date of enrollment into the study, a waiver of consent will be required; patients who have started and stopped treatment up to three months before ICF are eligible .

Most important exclusion criteria for potential participants:

Patients who are receiving isatuximab for an indication other than RRMM

* Patients who have received any other investigational drug or prohibited therapy for this study within 28 days or five half-lives from randomization, whichever is longer
* Patients having contraindication to the isatuximab summary of product characteristics (SMPC) or package insert (PI)
* Patients having contraindications as noted in the drug-specific local isatuximab SMPC/PI of combination drugs
* Any country-related specific regulation that would prevent the patient from entering the study

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.