A Study of Clinical Outcomes in Patients With Relapsed/Refractory Multiple Myeloma (RRMM) Treated With T-cell Redirectors Outside of Clinical Trials

Inclusion Criteria: * Have a documented diagnosis of multiple myeloma * Received the first dose of teclistamab on or before 31 December 2022, regardless of the duration of teclistamab treatment (REALiTEC cohort 1) OR Received the first dose of teclistamab from 01 January 2023 to 31 December 2024, inclusive, regardless of the duration of teclistamab treatment (REALiTEC cohort 2) OR Received the first dose of teclistamab from 01 January 2025 to 31 December 2025, inclusive, regardless of the duration of teclistamab treatment (REALiTEC cohort 3) OR Received the first dose of talquetamab on or before 31 December 2023, regardless of the duration of talquetamab treatment (REALiTAL cohort). Participants who received both teclistamab \& talquetamab can be included in both REALiTEC and REALiTAL cohorts * Received at least one dose of teclistamab/talquetamab * Provision of a patient-signed informed consent form (ICF), or an ICF waiver for deceased patients as applicable based on country/site-specific requirements Exclusion Criteria: * To be excluded from REALiTEC cohorts if received teclistamab as part of an interventional clinical trial * To be excluded from REALiTAL cohort if received talquetamab as part of an interventional clinical trial * Participants who have received teclistamab as part of a Janssen pre-approval access program are excluded from the REALiTEC Cohort 2 and REALiTEC Cohort 3