Clinical Study of Reduced-dose Pomalidomide and Cyclophosphamide Combined With Dexamethasone in the Treatment of Patients With Debilitating RRMM

This is an open-label clinical study to evaluate the efficacy and safety of a multicenter, open-label clinical study of a base-reduced-dose pomalidomide, cyclophosphamide combined with dexamethasone (PCd) regimen for the treatment of patients with debilitating relapsed refractory multiple myeloma. Subjects meeting the enrollment criteria were screened for entry into the study and treated with the appropriate regimen; all patients enrolled in the study did not receive medications other than those specified in the regimen for the treatment of myeloma during the study period, except for supportive care. The primary endpoint of the study is ORR; secondary study endpoints include efficacy above VGPR, progression-free survival (PFS), overall survival (OS), TTNT, safety, and life scale assessment.