CDKN2A and acute lymphoblastic leukemia: It has the advantages of low price and short turn-around time in the detection of important copy number changes in the most frequently altered gene loci in BCP-ALL, namely, EBF1, IKZF1, PAX5, CDKN2A/B, ETV6, BTG1, RB1, and PAR1 (for the detection of P2RY8-CRLF), in the Xp22.33/Yp11.32 region.