Given the outcome differences among patients with varying cytogenetic abnormalities, we assessed paired samples from different subtypes of ALL, including t(12;21) (TEL-AML1), t(1;19) (E2A-PBX1), t(9;22) (BCR-ABL) (data not shown), and other B-ALL (with no translocation). Here, BCR is linked to acute lymphoblastic leukemia.