Allogeneic TRAC Locus-inserted CD19-targeting STAR T Cell Therapy in r/r B-NHL

Phase 1 (dose escalation) In phase 1, 6 to 18 subjects will be enrolled. Subjects will receive 3 doses of allogeneic CD19-STAR T cell therapy (2 × 10\^6 cells/kg, 6 × 10\^6 cells/kg, 1.8 × 10\^7 cells/kg) from low dose to high dose according to the "3 + 3" principle: 1. Three patients were enrolled in the lowest dose group. 2. Subsequent patients were enrolled according to the following rules: 1. If the incidence of dose limiting toxicity (DLT) was 0/3, 3 patients were enrolled in the next high-dose group. 2. If the incidence of DLT was 1/3, 3 patients were enrolled at the same dose; If the incidence of DLT was 1/3 + 0/3, 3 patients were enrolled in the next high-dose group. If the incidence of DLT was 1/3 + 1/3, this dose was defined as maximum tolerated dose (MTD); If the incidence of DLT was 1/3 + 2/3 or 1/3 + 3/3, the previous dose was MTD. 3. If the incidence of DLT was 2/3 or 3/3, the previous dose was MTD. To ensure the safety of the subjects, the first subject in each dose group was observed for at least 28 days after the cell infusion. If no DLT occurred, the remaining two subjects could be enrolled and treated at the same dose level. The safety data of all subjects in each dose group until day 28 should be reviewed and tolerated before proceeding to the next dose group trial. No dose escalation was allowed for the same subject during the trial. If a subject drop out during the observation period due to non-DLT reasons, new subjects should be enrolled to make up for the number of subjects who drop out. Phase 2 (expansion cohort) In phase 2, 10 to 12 subjects will be enrolled and receive allogeneic CD19-STAR T cell infusion at dose of recommended phase 2 dose (RP2D), which will be determined based on the MTD, occurrence of DLT, the obtained efficacy results, pharmacokinetics / pharmacodynamics and other data according to the phase 1. Objectives The primary objectives of the phase 1 are to evaluate the tolerability, safety, and determine RP2D. The primary purpose of the phase 2 study is to evaluate the efficacy.