UTAA17 Injection in the Treatment of Relapsed/Refractory Multiple Myeloma

Inclusion criteria

• All subjects or legal representatives must sign an informed consent form approved by the Ethics Committee in person before commencing any screening process.
• ≥18 years old, regardless of gender, diagnosed with relapsed or refractory multiple myeloma according to the Efficacy Evaluation Criteria for multiple myeloma (IMWG), where relapsed or refractory is defined as: Multiple myeloma that has failed or relapsed after at least 3 lines of therapy (including proteasome inhibitor and immunomodulator-based chemotherapy regimen) in which induction chemotherapy, stem cell transplantation, and maintenance therapy given consecutively are considered a treatment regimen if no disease progression occurs during treatment.
• The presence of measurable lesions at the time of screening will be determined according to any of the following criteria:

• Monoclonal plasma cells in bone marrow ≥ 10%.
• Serum monoclonal protein (M-protein) level ≥10 g/L.
• Urinary M protein level ≥200 mg/24 hours.
• Light chain multiple myeloma with no measurable lesions in serum or urine: serum immunoglobulin free light chain ≥10 mg/dL and abnormal serum immunoglobulin κb /γ free light chain ratio.
• There are extramedullary lesions.
• BCMA expression on the cell membrane is positive by flow cytometry and/or immunohistochemistry.
• Patients were unable to undergo autologous hematopoietic stem cell transplantation or relapsed after autologous hematopoietic stem cell transplantation and were determined by the investigators to require treatment.
• Patients who have previously received CAR T cell therapy should not be included until at least 3 months after the last CAR T cell infusion and no previously used CAR T cells are detectable in peripheral blood or bone marrow.
• The ECOG score is 0 or 1.
• Expected survival ≥12 weeks.
• Subjects must have appropriate organ function and meet all of the following laboratory test results prior to enrollment

• Blood routine: Absolute neutrophil count (ANC) >0.75×10^9 /L; Absolute lymphocyte count (ALC) ≥0.3×10^9 /L; Platelet ≥50×10^9 /L; Hemoglobin >60 g/L
• Liver function: alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤2.5 × upper limit of normal (ULN); Serum total bilirubin ≤1.5×ULN, except patients with Gilbert syndrome (patients with Gilbert syndrome ≤3.0 times the upper limit of normal and direct bilirubin ≤1.5 times the upper limit of normal can be included)
• Renal function: serum creatinine ≤2.5×ULN
• Coagulation function: fibrinogen ≥ 1.0g /L; Activated partial thromboplastin time, activated partial thromboplastin time ≤1.5×ULN, and prothrombin time (PT) ≤1.5×ULN
• Must have a minimum level of lung reserve, blood oxygen saturation > 92%
• Hemodynamically stable and left ventricular ejection fraction (LVEF) ≥ 50% as determined by echocardiography.

Exclusion criteria

• Patients who were determined by the investigators to require long-term immunosuppressant use during screening.
• Cerebrovascular accident or convulsive attack occurred within 6 months before signing the informed consent.
• Other malignancies other than MM, except carcinoma in situ.
• Hepatitis B surface antigen (HBsAg) positive; Hepatitis B core antibody (HBcAb) positive and peripheral blood hepatitis B virus (HBV) DNA titer detection is not within the normal reference value range; Hepatitis C virus (HCV) antibody positive and peripheral blood hepatitis C virus (HCV) RNA positive; Human immunodeficiency virus (HIV) antibody positive; cytomegalovirus (CMV) DNA test positive; EBV virus DNA and herpes virus DNA positive test; Syphilis test positive.
• Serious heart disease: including, but not limited to, unstable angina, myocardial infarction (within 6 months prior to screening), congestive heart failure (NYHA classification ≥III), and severe arrhythmia.
• Unstable systemic disease, as determined by the investigator: including, but not limited to, severe liver, kidney, or metabolic disease requiring medical treatment.
• There are chronic progressive neurological disorders.
• Patients who have not yet recovered from the acute toxic effects of prior treatment.
• Presence of active or uncontrolled infections that require systemic treatment (except for mild genitourinary and upper respiratory tract infections).
• Female subjects who are capable of becoming pregnant and plan to become pregnant within 2 years after cell transfusion; Or a male subject whose partner plans to become pregnant within 2 years of cell transfusion.
• The researchers assessed that there were other conditions that were not suitable for inclusion.