Best response rates after JCAR021 CD19 CAR T-cell therapy. (A) Overall response by NCCN criteria. (B) MRD-negative BM response by MFC in patients with measurable BM disease before LD. (C) EM PET-CT response by NCCN imaging criteria in patients with FDG-avid measurable EMD before LD. ORR, overall response rate; PR, partial response.