CAR-T Following ASCT for Relapsed/Refractory B-Cell Non-Hodgkin's Lymphoma (R/R B-NHL) With High-Risk Prognostic Factors

This is a single-center, single-arm, open-label, prospective clinical trial to evaluate the efficacy and safety of CD19 CAR-T infusion following high-dose chemotherapy and autologous stem-cell transplantation (HDT/ASCT) in relapsed or refractory B-cell Non-Hodgkin's Lymphoma patients with high-risk prognostic factors (extranodal involvement/bulky mass ≥5 cm in diameter/TP53 alterations). CD19 CAR-T will be infused on day +3 (±1d) with a fixed dose of 100X10\^6. The study will assess the safety and efficacy of this combinational therapy, including the investigators assessed the best complete response rate (BCR) in 3 months (primary endpoint), objective response rates, survivals, incidence and severity of cytokine release syndrome (CRS), immune effector cell-associated neurotoxicity syndrome (ICANS), hematological, and other non-hematological toxicities of the subjects.