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The Evolution of Loss of Heterozygosity on Chromosome 17 during the Progression to Barrett’s Adenocarcinoma Involves a Unique Combination of Target Sites in Individual Specimens¹

Molecular Genetics and Oncology Group, Clinical Dental Sciences [J. R. D., J. G., K. D., B. C. O., J. K. F.], Department of Pathology [J. R. G.], Department of Medicine [B. C. O., A. J. M. W.], and Roy Castle International Centre for Lung Cancer Research [P. F., J. K. F.], The University of Liverpool, Liverpool L69 3BX, and Department of Surgery, Thameside General Hospital, Ashton Under-Lyne, Greater Manchester OL6 9RW [K. D.], United Kingdom

We have previously identified thirteen common minimally deleted regions (MRs) on chromosome 17 in twelve Barrett’s esophageal adenocarcinoma (BOA) specimens using 41 precisely mapped microsatellite markers (Dunn et al., Oncogene, 17: 987–993, 1999). The aim of the present study has been to identify the earliest sites of loss on this chromosome that arise and persist during the progression to BOA. This has been undertaken by the analysis of multiple carefully microdissected tissue samples from each of five esophagectomy specimens, several of which contained identifiable premalignant tissue. Our data demonstrate a stepwise accumulation of loss in each analyzed specimen, consistent with a single clonal pathway in four specimens and several coexisting pathways in one specimen. Several clonal anomalies (loss preceding heterozygosity and variable intrasample degrees of loss at different markers) were also observed. Within extensively deleted regions of the tumor (seen in three specimens), small deletions were detected in premalignant tissue, predominantly at the site of our identified MRs, and these losses were seen to expand and merge during the progression to BOA. Clonal losses at MRs were first detected in tissue showing early changes histologically, including Barrett’s intestinal metaplasia and intermediate-grade dysplasia. Our results provide further support for many of the MRs we have previously identified, thereby adding to evidence for the existence of multiple novel cancer-associated genes on chromosome 17 involved in the development of BOA.

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