Figure 2: DNA copy-number alteration at chromosome 9q in arsenic-exposed lung SqCC. CNA frequencies are overlaid in this karyogram. Profiles of 52 lung SqCC biopsies were generated using a submegabase resolution tiling-set rearray (SMRTr) platform. Twenty-two arsenic-exposed samples (shown in red) were obtained from lung cancer patients from northern Chile. Thirty samples from patients without known arsenic exposure (green) were obtained from North American individuals. Regions in yellow denote a sector of overlapping alteration status in both groups. The magnitude of red, green, and yellow bars represents percentage of samples (0–100%, with blue vertical lines representing 50% frequency) exhibiting DNA gains (to the right) and DNA losses (to the left). Dotted line represents 9q12 cytoband.