Differential expression of apoptosis genes between ALL subtypes. The global test and Wilcoxon rank-sum test were performed to identify which of the indicated 118 apoptosis probe sets were differentially expressed in various ALL subgroups defined by T-versus B-lineage ALL (lineage), or genetic subtype (ie, TEL-AML1 status [TA], ploidy, and E2A status [E2A]). For each subgroup, probe sets selected only by the global test (P <.001) are light gray, probe sets selected only by Wilcoxon rank-sum test with false discovery rate (FDR) less than 5% are dark gray, probe sets selected by the global test (P <.001) and Wilcoxon rank-sum test with FDR are black, and probe sets selected by none of these tests are white. The numbers indicated in colored boxes are the ratio per significant gene between T-lineage ALL and B-lineage ALL samples (Lineage), hyperdiploid and nonhyperdiploid B-lineage ALL samples (Ploidy), TEL-AML1-positive and TEL-AML1-negative B-lineage ALL samples (TA), and E2A-rearranged and E2A-germline B-lineage ALL samples (E2A).