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Gamboa-Dominguez, A.* ; Seidl, S.* ; Reyes-Gutierrez, E.* ; Hermannstädter, C.* ; Quintanilla-Martinez, L. ; Busch, R.* ; Höfler, H. ; Fend, F.* ; Luber, B.*

Prognostic significance of p21WAF1/CIP1, p27Kip1, p53 and E-cadherin expression in gastric cancer.

J. Clin. Pathol. 60, 756-761 (2007)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

Abstract
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astric carcinoma is characterised by numerous genetic and epigenetic alterations that influence cell cycle progression, apoptosis and DNA repair. These alterations include down-regulation of the cyclin-dependent kinase (CDK) inhibitors p21(WAF1/CIP1) and p27(Kip1), and mutations of the tumour suppressor protein p53 and the cell adhesion molecule E-cadherin. Combined evaluation of the prognostic significance of these alterations has not been reported in Mexican Mestizo patients. AIMS: To evaluate p21(WAF1/CIP1), p27(Kip1), p53 and E-cadherin protein expression, including mutant E-cadherin variants with deletion of exon 8 (del 8) or 9 (del 9), in gastric cancer from Mexican patients. METHODS: Immunohistochemistry for the above-mentioned markers, including mutation-specific E-cadherin antibodies, was carried out in 69 gastric carcinomas; expression levels were correlated with histotype, tumour stage and prognosis. RESULTS: Expression of p21(WAF1/CIP1) alone or in combination with p27(Kip1) or in the absence of p53 was associated with favourable prognosis. Staining of del 8 and del 9 E-cadherin was found exclusively in patients negative for p53 and positive for p21(WAF1/CIP1), suggesting that the p21(WAF1/CIP1) regulatory function of p53 was intact. CONCLUSION: Combined evaluation of the prognostic significance of cell cycle regulators and E-cadherin should be performed. Even though patients negative for p53 and positive for p21(WAF1/CIP1) have a favourable prognosis, it may have a negative influence on prognosis if they acquire in addition E-cadherin mutations which have been shown previously to be associated with poor survival.

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