BIRC5 and acute lymphoblastic leukemia: Two of these concordant patients had partial or complete response with MRD level disease (AML-15, ALL-11, Figures 5C, D). One of these two had concurrent serial MRD monitoring of BIRC5/ABL1 ratios permitting comparison with a SOC peripheral blood MRD test and showed correlation between the ddPCR and the BCR-ABL test for surveillance (ALL-11; Figures 5D, E).