Real-World Use of Selinexor, Daratumumab and Dexamethasone in Chinese Patients With Multiple Myeloma at First Relapse

Inclusion Criteria: 1. According to the multiple myeloma diagnostic criteria of the International Myeloma Working Group (IMWG), there is the initial diagnosis of multiple myeloma. 2. Subjects must have previously received 1 anti-myeloma regimens. Subjects must have documented disease progression 3. Age ≥18 years; 4. Life expectancy \> 6 months; 5. patients should provide available clinical case files and/or detailed records of medical history, diagnosis and treatment information, and cooperate with clinical management; 6. Fertile women and men whose partner is of childbearing potential or pregnant should agree to practice complete abstinence or to use a condom during therapy and dose interruptions and for 90 days after the last treatment. Exclusion Criteria: 1. Patients who are contraindicated as per product label of XDd; 2. Known positive for HIV or active hepatitis B or C or other infectious diseases; 3. Pregnancy or lactation; 4. Patients with a history of malignant tumor that may affect the implementation or results analysis of this study (except cured basal cell carcinoma of the skin, carcinoma in situ of the cervix, carcinoma in situ of the breast, intramucosal carcinoma of the gastrointestinal tract in situ, and localized prostate cancer); 5. Any other medical condition, including mental illness or substance abuse, deemed by the investigator(s) to likely interfere with the patient's ability to sign informed consent, cooperate and participate in the study, or interfere with the interpretation of the results; 6. Patients who are unsuitable for this study judged by clinicians.