Scatterplots and Pearson correlation coefficients of paired PB and BM NGS-based MRD results. (A) Evaluable study cohort (N = 62) including 126 paired PB and BM NGS-based MRD results. (B) Patients undergoing HCT (N = 43) including 81 paired PB and BM results and patients undergoing CAR T (N = 17), including 45 paired PB and BM MRD results. (C) Patients with extramedullary (EM) involvement at any time during leukemia history (N = 27) including 60 paired PB and BM MRD results and patients with only BM involvement (N = 33), including 66 paired PB and BM MRD results.