S100A9 and acute lymphoblastic leukemia: Furthermore, several studies have reported some S100 members participated in drug resistance: higher expression of S100A8 and S100A9 leads to glucocorticoid resistance in MLL rearranged infant acute lymphoid leukemia (Spijkers-Hagelstein et al., 2012), while our previous study revealed elevated expression of S100A8 and S100A9 negatively associate with sensitivity to the BCL2 inhibitor venetoclax in AML (Karjalainen et al., 2019).