A Real World Study of Equecabtagene Autoleucel in Subjects With Relapsed and Refractory Multiple Myeloma.

Primary endpoint: Best Overall Response Rate (BOR): The proportion of patients who receive treatment with Ikeolensay injection and have been evaluated by researchers as having the best disease status is strict complete response (sCR), complete response (CR), very good partial response (VGPR), or partial response (PR). Secondary endpoint: Progress Free Survival (PFS) rate at 6 months: The probability of patients not experiencing disease progression or death from any cause after receiving treatment with Ikeolensay injection for 6 months; Overall survival (OS) rate at 6 months: the probability of survival of patients after receiving treatment with Ikeolensay injection for 6 months; Time to Response (TTR): The time interval between the patient receiving treatment with Ikeolensay injection and the first recorded time of disease remission; Time to Complete Response (TTCR): The time interval between the patient receiving treatment with Ikeolensay injection and the first recording of complete disease response (CR or sCR); Adverse Event (AE): After receiving treatment with Ikeolensay Injection, researchers consider all adverse events and serious adverse events (SAE) related to Ikeolensay Injection treatment; Hospitalization: After receiving treatment with Ikeolensay injection, the researcher considers any hospitalization related to Ikeolensay injection treatment (including the reason, duration, and outcome of hospitalization); Death: The death of the patient after receiving treatment with Ikeolensay injection, recording the date and cause of death (any reason); Secondary malignant tumors: For any secondary malignant tumors discovered during the monitoring process, researchers can obtain tumor biopsy samples and other necessary samples of tumor tissue according to clinical needs, relevant guiding principles, and product instructions for safety analysis; Quality of life: Evaluate the quality of life using the EQ-5D and EORTCQLQ C30 scoring standards; Medical resource utilization: Collect any medical resource utilization information related to the treatment of patients with Ikeolensay injection (including hospitalization, emergency, outpatient, and new prescription drug usage).