Clinical Study of Cord Blood-derived CAR-NK Cells Targeting CD19 in the Treatment of Refractory/Relapsed B-cell NHL

This is an open, single-arm, single-dose, dose-escalation clinical trial designed to evaluate the safety and the preliminary efficacy of CB CAR-NK019 cells. 9-18 patients are planned to be enrolled in the dose-escalation trial (2×10\^6 cells/kg ,3×10\^6 cells/kg, 4×10\^6 cells/kg) . The primary endpoints are DLT, MTD, and the second endpionts are the overall response rates (CR and PR), overall survival, and progression-free survival. Based on the results in the dose-escalation trial, the recommended dose will be determined. Another 30 patients will be enrolled to estimate the safety and efficacy of CB CAR-NK019 under the best dose.