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American Journal of Pathology, Vol 146, 1161-1169, Copyright © 1995 by American Society for Investigative Pathology

REGULAR ARTICLES

Overexpression and localization of cyclin D1 mRNA and antigen in esophageal cancer

H Naitoh, J Shibata, A Kawaguchi, M Kodama and T Hattori
First Department of Pathology, Shiga University of Medical Science, Japan.

We examined the expression of cyclin D1 mRNA in two human carcinoma cell lines (A431 and TT) and 17 specimens of esophageal cancer with in situ hybridization. Cyclin D1 mRNA was overexpressed in the cytoplasm of cancer cells that showed cyclin D1 gene amplification by Southern blot hybridization. Cyclin D1 antigen was overexpressed in the nucleus of these cancer cells. The distribution of cyclin D1 mRNA-positive cells was similar to that of cyclin D1 antigen-positive cells in the cancer tissues. We then attempted to correlate overexpression of cyclin D1 antigen and prognosis, by using 55 formalin-fixed, paraffin-embedded specimens of esophageal cancer. The overall 5-year survival of patients with strongly staining tumors was significantly lower than that of patients with weakly or nonstaining tumors (7 versus 59%; P < 0.01). There was no significant correlation between cyclin D1 expression and other clinicopathological factors. These results suggest that cyclin D1 may play an important role in carcinogenesis and that cyclin D1 overexpression may be a useful prognostic factor in esophageal cancer.

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