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Expression of p53 in imprint smears of endometrial carcinoma.

The aims of this study were to determine the expression of p53 protein in endometrial adenocarcinomas (as a potential prognostic indicator before treatment) as well as normal endometrium in imprint smears and to correlate the results with clinicopathologic parameters of primary untreated endometrial cancer patients. Two hundred fifty five patients were evaluated with endometrial imprint cytology during a 29-month period. Endometrial samples freshly resected from women who underwent total abdominal hysterectomy were studied. One hundred twenty six patients had endometrial carcinoma and 129 cases were diagnosed as normal endometrium. The expression of p53 was assessed by immunocytochemistry. Positive staining was correlated with increased surgical-pathological stage, histological grade and lymph node metastases. High expression of p53 staining was significantly more frequent in histological type II than type I endometrial adenocarcinoma. High-grade endometrial carcinoma had higher proportions and stronger intensity compared with low-grade carcinoma. Negative immunostain for p53 protein was found in proliferative, secretory, and atrophic endometrium. Immunocytochemical findings from p53 stain, in addition to cytomorphologic features, appeared to be useful in the diagnosis and in the postoperative prognosis of endometrial carcinoma in endometrial cytology, especially if combined with other markers. High p53 expression correlates with morphologic features of aggressiveness and the expression pattern of p53 correspond to the expected cyclic/atrophic pattern in normal endometrium.