Representation from Genotyping Console 3.0 (Affymetrix) of IKZF1 deletions or monosomy 7 in 4 BCR-ABL1–positive ALL patients. Patients #23, #105, and #103 have a monoallelic deletion (DNA copy number state = 1) of different regions of IKZF1. Patient #95 shows a biallelic deletion. Normal diploid DNA content is shown as a continuous line of copy number state = 2. Red segment reports indicate the genomic extent of the IKZF1 deletions. The opalescent vertical box indicates the gap (chr7:50338126-50378125) inside the IKZF1 gene.