Bcl-2 was over-expressed in all fresh cases, and cell lines except the WSU-WM (expressed low levels), Bcl-XL was expressed in all patient cells and cell lines (except WSU-ALL cell line) and Mcl-1 was low only in WSU-ALL, WSU-DLCL2 and pt4. This evidence concerns the gene BCL2 and acute lymphoblastic leukemia.