RB1 and acute lymphoblastic leukemia: In their SNP array analysis of 50 cases of T-ALL, Mullighan et al. [32] identified multiple new genomic changes in T-ALL, including deletions of TAL1, RB1, and PTEN, and duplications of protooncogene MYB. Most recently, Karrman et al. [33] investigated 47 cases of T-ALL with an Illumina HumanOmni1-Quad BeadChip containing >1 million markers and a median marker interval of 1.5 kb.