A Clinical Study Assessing the Subcutaneous Formulation of TQB2934 for Injection in Subjects With Malignant Plasma Cell Tumors

Inclusion Criteria: * The subjects voluntarily joined the study, signed an informed consent form, and had good compliance; * 18 years old≤age≤75 years old (calculated based on the date of signing the informed consent); Eastern Cooperative Oncology Group Performance Status (ECOG) score 0\~2 points; expected survival is greater than 12 weeks; * Subjects with multiple myeloma must meet: 1) have a diagnostic record and meet the International Myeloma Working Group Relapsed (IMWG) diagnostic criteria; 2) there is a measurable lesion; 3) Refractory Multiple Myeloma (RRMM) has received at least one line of treatment, and at least one proteasome inhibitor (PI), an immunomodulator (IMiD) and a Cluster of Differentiation 38 (CD38) monoclonal antibody are refractory; 4) disease progression within 12 months after the last treatment or treatment; * Laboratory inspection standards that meet the program requirements; * Women of childbearing age should agree that effective contraception must be adopted during the study period and within 6 months after the end of the study, and that serum or urine pregnancy tests will be negative within 7 days before the study enrollment; men should agree that effective contraception must be adopted within 6 months after the end of the study period; Exclusion Criteria: * Diagnosed with amyloidosis, active plasma cell leukemia (PCL, peripheral plasma cell proportion ≥5%, or absolute peripheral plasma cell count ≥0.5×109/L), Fahrenheit macroglobulinemia (WM) …