MCL1 and acute lymphoblastic leukemia: To determine the relevance of these findings in the human ETP-ALL context we compared the expression of BCL2, BCL2L1 (BCL-XL), MCL1 pro-survival factors and BCL2L11 (BIM) pro-apoptotic factor in ETP-ALL (N = 12) and mature T-ALL (N = 40) patient samples (Fig. S3A).