BCL2 expression was significantly higher in PhnegALL patients, whereas PhposALL had significantly higher expression of BCL-W, and a trend to higher BCL-XL expression. Thus, poorer venetoclax efficacy in PhposALL ex vivo is correlated to higher dependency on BCL-W and BCL-XL. In addition, cysteinyl leukotriene receptor 1 (CYSLTR1) expression was significantly higher in PhposALL samples (Figure 1).