Percentage of metaplastic, dysplastic, and oesophageal adenocarcinoma samples that had chromosome 4/8 hyperploidy, monoallelic p16, or lacked their Y chromosome. The results are derived from analysis of 28 patients with metaplasia (BM), 20 with low grade dysplasia (LGD), eight with high grade dysplasia (HGD), and seven with oesophageal adenocarcinoma (OA).