CD19/CD20 Dual-Target in Vivo CAR-T Lentiviral Product in the Treatment of Relapsed/Refractory B-cell Malignancies

Inclusion Criteria: 1. Subjects voluntarily participate in clinical studies; Fully informed of this study and signed informed consent; Informed consent form must be obtained prior to initiation of any study-related tests or procedures that are not part of the standard treatment for the subject's disease; Good compliance and cooperation with follow-up. 2. Age greater than or equal to 18. 3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. 4. At least one measurable tumor lesion. 5. Eligible subjects shall meet the criteria and qualification requirements of any one of the expansion cohorts as follows: * Cohort 1: Relapsed or refractory large B-cell lymphoma patients who have received at least one line of systemic therapy and have not undergone CAR-T therapy; * Cohort 2: High-risk large B-cell lymphoma patients in the first-line setting (who have completed 2 cycles of standard first-line systemic immunochemotherapy); * Cohort 3: Relapsed or refractory mantle cell lymphoma patients treated with at least two lines of systemic therapy; * Cohort 4: Exploratory cohort including relapsed or refractory indolent lymphoma and other B-cell malignancies. 6. Life expectancy≥ 3 months 7. Clinical laboratory values meet screening visit criteria 8. Adequate organ function; Exclusion Criteria: Subject eligible for this study must not meet any of the following criteria: 1. Prior antitumor therapy with insufficient washout period ; 2. Prior treatment with lentiviral vector-based gene therapies; 3. Patients who are positive for hepatitis B surface antigen (HBsAg), hepatitis B virus deoxyribonucleic acid (HBV DNA), hepatitis C antibody (HCV-Ab), hepatitis C virus ribonucleic acid (HCV RNA), and human immunodeficiency virus antibody (HIV-Ab). 4. Known life-threatening allergic reaction, hypersensitivity reaction, or intolerance to study drug excipients and related excipients, including but not limited to DMSO; or those with a history of severe allergic reactions in the past (such as hypersensitivity reactions, or those with severe immune-related reactions such as the need for glucocorticoids to prevent anaphylaxis as assessed by the investigator). 5. Lactating women;