ETV6 and precursor B-cell acute lymphoblastic leukemia: t(12;21)(p13.2;q22.1) [ETV6-RUNX1]; t(9;22)(q34.1;q11.2) [BCR-ABL1]; t(v;11q23.3) [KMT2A (MLL) translocation]; iAMP21; and trisomy 4 and 10 in pediatric B-ALL.