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Advances in Brief |
Departments of Surgery [C. A. E., R. V. L., S. K. K., M. L. S., T. I. L., J. H. P., T. R. D., P. W. L., K. A. S.], Biochemistry and Molecular Biology [C. A. E., T. I. L., K. D. D., P. V. D., P. W. L.], and Pathology [K. W.], University of Southern California, Keck School of Medicine, Norris Comprehensive Cancer Center, Los Angeles, California 90089-9176
Esophageal adenocarcinoma (EAC) is thought to develop through a
multistage process in which Barretts metaplasia progresses through
low- and high-grade dysplasia to invasive cancer. Transcriptional
silencing of tumor suppressor genes by promoter CpG island
hypermethylation has been observed in many types of human cancer.
Analysis of CpG island hypermethylation in EAC has thus far been
limited to the CDKN2A (p16) gene. In this study, we
extend the methylation analysis of EAC to include three other genes,
APC, CDH1 (E-cadherin), and
ESR1 (ER, estrogen receptor
), in
addition to CDKN2A. Molecular analysis can provide
insight into the complex relationships between tissues with different
histologies in Barretts esophagus and associated adenocarcinoma.
Therefore, we have mapped the spatial distribution of methylation
patterns in six esophagectomy cases in detail. Hypermethylation of the
four CpG islands was analyzed by the MethyLight technique in 107
biopsies derived from these six patients for a total of 428 methylation
analyses. Our results show that normal esophageal squamous epithelium
is unmethylated at all four CpG islands. CDH1 is
unmethylated in most other tissue types as well. Hypermethylation of
ESR1 is seen at high frequency in inflammatory reflux
esophagitis and at all subsequent stages, whereas APC
and CDKN2A hypermethylation is found in Barretts
metaplasia, dysplasia, and EAC. When it occurs, hypermethylation of
APC, CDKN2A, and ESR1 is
usually found in a large contiguous field, suggesting either a
concerted methylation change associated with metaplasia or a clonal
expansion of cells with abnormal hypermethylation.
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