Study of CAR-T Cell Therapy in the Treatment of Relapsed/Refractory Hematological Malignancies

Inclusion Criteria: 1. Histological diagnosis of hematological malignancies (such as lymphoma, myeloma, leukemia) refractory to, or relapsing after standard therapy. 2. Positive expression of specific antigens. 3. Eastern Cooperative Oncology Group (ECOG) performance status of 0\~2. 4. Adequate organ functions: * Serum bilirubin ≤ 35 μmol/L; * Serum aspartate aminotransferase (AST)/alanine aminotransferase (ALT) \< 2; * Serum creatinine (Cr) ≤ 2 × upper limit of normal (ULN); * Brain natriuretic peptide (BNP)\<80 pg/mL. 5. Subjects must be able to understand the protocol and be willing to enroll the study, sign the informed consent, and be able to comply with the study and follow-up procedures. Exclusion Criteria: 1. History of allergy to any of the drugs involved in the protocol. 2. History of cardiac diseases: * Left ventricular ejection fraction (LVEF) \< 50%; * Class III or IV heart failure as defined by the New York Heart Association (NYHA). 3. History of another malignancy tumor. 4. Active hepatitis C (HCV), hepatitis B (HBV), human immunodeficiency virus (HIV), or syphilis infection. 5. Patients with any contraindications to allogeneic hematopoietic stem cell transplantation. 6. Uncontrolled fungal, bacterial, viral, or other infection. 7. Female subjects who are pregnant or lactating.