In this phase 1/2 clinical trial conducted at two centers, we compared the efficacy and safety of ssCART-19 to classical CART-19 cells (cCART-19) in patients with r/r B-ALL (NCT03919240)...Lymphodepletion (fludarabine at 30 mg/m2/day and cyclophosphamide at 300 mg/m2/day) was conducted on days -5, -4, and -3 before infusion... Our clinical studies demonstrated the safety and high efficacy of ssCART-19 with IL-6 gene silencing in patients with relapsed/refractory B-ALL. These findings support the potential of ssCART-19 as a promising therapeutic approach for this challenging patient population.