Ten R/R patients with either CD19+ or CD19/CD20+ B-ALL were enrolled (median age of 23 years [11-55])....9/10 patients received a single infusion of dual STAR-T at a median dose of 1×106/kg (6 of 1×106/kg and 3 of 2×106/kg)...The CD19/CD20 STAR-T demonstrated technical feasibility and the ability to achieve a high CR with low toxicity in a phase I study of R/R B-ALL.