CALR and acute myeloid leukemia: Interestingly, similar to the cell lines, a group of FAB‐M5 AML patients were more sensitive to RO‐BIR2 (median 11 μm), followed by samples with FAB‐M1 (median 13.5 μm) and FAB‐M2 (median 16 μm) (Fig. 2D).