Prognostic significance of apoptotic cell death in bladder cancer : a tissue microarray study on 179 urothelial carcinomas from cystectomy specimens

Abstract

Aims: To assess the prognostic significance of apoptosis related markers in bladder cancer.Methods: A tissue microarray containing 179 bladder carcinomas from cystectomy specimens was analysed immunohistochemically for active caspase-3, single-stranded DNA (ssDNA), p53, Bcl-2, Bax, and COX-2, in correlation to clinicopathological factors.Results: Active caspase-3, ssDNA, p53, Bax and COX-2 were more frequently observed among high grade and higher stage (!T2) carcinomas compared with low grade and lower stage (T1) tumours. On the contrary, Bcl-2 was more frequently detected in T1 than in !T2 carcinomas. Active caspase-3 correlated with a better survival of the patients.Conclusions: The decreased detection of active caspase-3 and ssDNA and the increased presence of Bcl-2 in T1 carcinomas suggest that alterations in interrelated apoptosis markers may play an important role in the progression of urothelial carcinoma from a superficially infiltrating to a muscle invading tumour and would help to better characterise a subpopulation of T1 carcinomas that could profit from early cystectomy or more aggressive adjuvant chemotherapy. Active caspase-3 might be an important prognostic factor in bladder cancer.