• 1\. Diagnosed with high-risk multiple myeloma (del17p, t (4; 14), t (14; 16), 1q21 by FISH test) or extramedullary multiple myeloma; 2. Age: 18-70 years old (including 18 and 70 years old), regardless of gender; 3. Eastern Cooperative Oncology Group physical performance score (ECOG): 0-2 points; 4. Expected survival ≥3 months; 5. Have measurable lesions: extramedullary lesions ≧1.0cm or more; serum M protein ≥10g/L and/or 24-hour urine M protein ≥200mg; 6. Blood routine: neutrophil count ≥1.0×109/L; for patients with plasma cells in bone marrow \>50%, 0.5×109/L≤neutrophil count \<1.0×109/L is allowed. For patients with platelets ≥100×109/L; plasma cells in bone marrow \>50%, 50×109/L≤platelets \<100×109/L; hemoglobin \>8g/dL; 7. Liver function: AST and ALT ≤ 2.5 times the upper limit of normal value (for the same age group), or ≤ 5 times the upper limit of normal value in the presence of liver metastasis; total bilirubin ≤ 1.5 times the upper limit of normal value; creatinine ≤ 2.5 mg/dL ; 8. Patients receiving localized radiation therapy, with or without concomitant steroids, for pain control or spinal cord/nerve root compression treatment are eligible. More than 4 weeks since the last radiotherapy treatment; 9. Sign the informed consent form.