BCL2L1 and acute lymphoblastic leukemia: To explore the expression pattern of pro-survival BCL2 family proteins, we analyzed the mRNA expression of BCL2, BCL2L1 (BCL-XL), BCL2L2 (BCL-W), and MCL-1 from seven T-ALL patient cohorts in which a wide range of variations in terms of their expression was demonstrated (Supplementary Figure S1A,B).