Inclusion Criteria:
* Eligible for treatment with cilta-cel per United States Prescribing Information (USPI)
* Has serious or life-threatening multiple myeloma per USPI, and where re-apheresis, re-manufacturing, or other anti-myeloma directed therapy is not considered feasible or adequate per treating physician discretion
* Favorable participant benefit/risk assessment determined by Janssen medical review
* Treating physician confirms the favorable risk benefit profile, and that proceeding with this treatment is in the best interest of the participant
* Able to provide informed consent indicating they understand the purpose of this expanded access program (EAP)
* A woman of childbearing potential must have a negative highly sensitive serum (beta-human chorionic gonadotropin \[beta-hCG\]) pregnancy test during screening and prior to the first dose of cyclophosphamide and fludarabine
