Prevalence of loss of heterozygosity (LOH) at chromosomes 9p and 17p in flow cytometrically sorted cell populations from patient biopsy tissues from Barrett’s epithelium. A total of 404 sorted fractions from 60 patients with a final diagnosis of high-grade dysplasia were evaluated, including 53 2N fractions (diploid G0/G1), 167 G1 fractions (Ki67-positive G1), 108 G2/M fractions (4N DNA content composed of <6% of the cells in the biopsy), 15 increased 4N fractions (4N DNA content composed of >6% of the cells in the biopsy), and 61 aneuploid populations.