A Study of ESO-T01 in Treating Relapsed/ Refractory Multiple Myeloma

Prior treatment

• Previous anticancer treatment (as determined by the investigator): a. Received targeted therapy, epigenetic therapy, other investigational drugs, or treatment using invasive investigational medical devices within 5 half-lives; b. Received immune/non-immune-directed systemic therapy within 1 week; Received cytotoxic therapy within 1 week; c. Received proteasome inhibitors or immunomodulatory agent therapy within 2 weeks; d. Received radiotherapy within 4 weeks (if the radiation field covered ≤5% of bone marrow reserve, the subject is eligible regardless of the date of radiotherapy completion);
• Received allogeneic HSCT within 6 months prior to infusion, or autologous HSCT within 3 months prior to infusion;
• Other malignancies prior to screening (except the following): Malignancies treated with curative intent and no evidence of active disease ≥2 years before enrollment; Adequately treated non-melanoma skin cancer with no evidence of disease;
• Previously treated with any viral therapy using VSVG pseudotype virus;
• Positive for hepatitis B surface antigen (HBsAg) or hepatitis B core antibody (HBcAb) with elevated peripheral blood HBV DNA levels within 6 months prior to infusion; Positive for hepatitis C antibody (HCV Ab) with elevated peripheral blood HCV RNA levels; Positive for HIV antibody; Positive for syphilis;
• Symptomatic heart failure or significant arrhythmias: NYHA Class III or IV congestive heart failure; Myocardial infarction or coronary artery bypass grafting (CABG) or coronary stent implantation within ≤6 months prior to signing ICF; Clinically significant ventricular arrhythmias or unexplained syncope (except when caused by vasovagal or dehydration); Significant non-ischemic cardiomyopathy history;
• Other significant diseases: Primary immunodeficiency; Stroke or seizure within 6 months prior to screening; Obvious clinical evidence of dementia or altered mental status; History of Parkinson's disease or Parkinsonism;
• Surgery within 2 weeks prior to treatment or planned surgery within 2 weeks post-treatment, except for local anesthesia procedures;
• Use of live-attenuated vaccines within 1 month before treatment;

Other illness

• Serious uncontrolled infections during screening: Bacterial, viral, fungal, etc. infections;
• Known severe allergic reaction to ESO-T01 or its formulation components;
• Known severe allergic reaction to Tocilizumab;
• Any other condition deemed by the investigator as unsuitable for participation in the study.

Other

• Inability to establish venous access;

• Age ≥ 18 years；
• Diagnosis of multiple myeloma (MM) confirmed according to the IMWG diagnostic criteria, with BCMA expression on MM cells determined by flow cytometry or immunohistochemistry;
• Previously treated with at least 2 lines of anti-MM therapy, with at least 1 complete treatment cycle for each line, and disease progression within 12 months after the most recent anti-myeloma treatment, or being refractory to both immunomodulatory drugs and proteasome inhibitors, along with disease progression within 2 months after the most recent anti-myeloma treatment (according to the IMWG diagnostic criteria);
• Disease must be measurable at screening, meeting at least one of the following criteria:Serum M-protein level ≥ 0.5 g/dL; Urinary M-protein level ≥ 200 mg/24h; Serum involved free light chain ≥ 10 mg/dL and an abnormal serum free light chain κ/λ ratio;
• ECOG score 0-2, with an expected survival time ≥ 3 months;
• Bone marrow function at screening (or within 2 months prior to screening) meets the following criteria: a.Hemoglobin ≥ 6 g/dL (no red blood cell transfusion within 1 week before screening), recombinant human erythropoietin is allowed; for patients who meet the ≥6 g/dL criterion at screening, red blood cell transfusion is allowed to maintain hemoglobin ≥ 6 g/dL; b.Absolute neutrophil count (ANC) ≥ 600/μL (no use of granulocyte colony-stimulating factor (G-CSF) within 1 week or pegylated G-CSF within 2 weeks prior to screening); c. Platelet count ≥ 50,000/μL; d. Lymphocyte count ≥ 500/μL; e. Absolute CD3-positive T cell count ≥ 150/μL;
• Renal function at screening (or within 2 months prior to screening) should be normal, with a creatinine clearance ≥ 45 mL/min;
• Liver function at screening (or within 2 months prior to screening) must meet the following criteria: a. Alanine transaminase (ALT) and aspartate transaminase (AST) ≤ 3.0 × the upper limit of normal (ULN); b. Total bilirubin (TBIL) and alkaline phosphatase (AKP or ALP) ≤ 2.0 × ULN (except for congenital hyperbilirubinemia, such as Gilbert's syndrome, where direct bilirubin can be ≤ 1.5 × ULN); c. Albumin ≥ 3 g/dL;
• Cardiac function at screening (or within 2 months prior to screening) must meet the following criteria: a. Left ventricular ejection fraction ≥ 40% (measured by echocardiogram or MUGA scan); b. No clinically significant pericardial effusion detected; c. No clinically significant ECG abnormalities detected;
• Pulmonary function at screening (or within 2 months prior to screening) must meet the following criteria: Oxygen saturation ≥ 90%;No clinically significant pleural effusion detected;
• For women of childbearing potential, a negative pregnancy test must be obtained at screening and prior to drug infusion, and they must not be breastfeeding;
• Male and female subjects of childbearing potential must agree to use effective contraception from the time of informed consent until 1 year after the study drug administration;
• Male and female subjects of childbearing potential must agree not to donate sperm or eggs (oocytes) or other reproductive cells from the time of informed consent until 1 year after the study drug administration;
• The participant or their legally authorized representative must provide written informed consent (ICF), indicating their understanding of the purpose and procedures of the study and their willingness to participate.