Safety and Efficacy of RN1201 Injection as First-Line Treatment for Newly Diagnosed Multiple Myeloma

Inclusion Criteria: 1. Willingness to participate in the trial and provide written informed consent. * 2\. Diagnosis of multiple myeloma (MM) per the 2017 revised WHO criteria. * 3\. BCMA-positive multiple myeloma documented at screening or in prior medical records. * 4\. Aged 18 - 70 years, any gender. * 5\. Life expectancy of at least 12 weeks. * 6\. Serum total bilirubin \< twice the upper limit of normal (ULN); serum creatinine within normal range; * 7\. alanine aminotransferase (ALT) and aspartate aminotransferase (AST) \< three times ULN. * 8\. ECOG performance status score of 0 - 2. * 9\. Left ventricular ejection fraction (LVEF) ≥50% with no pericardial effusion. * 10\. Ability to adhere to the study visit schedule and protocol requirements. Exclusion Criteria: 1. Patients with serious active infections. * 2\. Subjects with acquired or congenital immunodeficiency. * 3\. Subjects with Class III/IV heart failure per NYHA criteria. * 4\. Subjects with epilepsy or other central nervous system diseases. * 5\. Subjects with a history of primary cancer, except: 1. Resected non-melanoma (e.g., basal cell carcinoma) 2. Cured carcinoma in situ (e.g., cervical, bladder, breast cancer) * 6\. Systemic high-dose steroid use within 2 weeks before treatment. * 7\. Pregnant, breastfeeding women, or those planning pregnancy in 6 months. * 8\. Participation in other clinical trials within one month. * 9\. Major surgery within 14 days before the first study drug dose. * 10\. Any condition the investigator deems may raise subject risks or affect trial results.