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Patterns of immunohistochemical staining for p53 expression in hyperplastic endometrium and adenocarcinoma.

The p53, a tumour suppressor gene, is the most commonly mutated gene human cancer. In this study, we performed immunohistochemical investigations of the expression of p53 protein in hyperplastic endometrium and adenocarcinoma. Positive immunostaining was detected in 7 (30%) cases of invasive adenocarcinoma, 2 (12%) cases of simple hyperplasia with atypia and 2 (14%) cases of complex hyperplasia with atypia. In simple and complex hyperplasia without atypia staining was seen in occasional cells. The results suggested that endometrial hyperplasia is not always accompanied by p53 protein accumulation, hence its expression is not an early exponent of the neoplastic process.