There are few reliable markers to distinguish tumors with aggressive characteristics from others at the time of initial diagnosis in non-muscle-invasive bladder cancer. The purpose of this study was to identify a genomic marker that allows the prediction of prognosis for non-muscle-invasive bladder cancers. We screened the genome-wide copy number in 41 patients with non-muscle-invasive urothelial carcinoma of the bladder by array-based comparative genomic hybridization using arrays spotted with 4,030 bacterial artificial chromosome clones. A loss of 8p23.3 (clone 923) was correlated significantly with a higher histological grade (P = 0.0026) and advanced pathological stage (P = 0.0148). Both recurrence-free and progression-free survival rates were lower in patients with tumors without 8p23.3, compared with those with 8p23.3 (P = 0.0146 and 0.0473, respectively; log-rank test). These data suggest that the loss of 8p23.3 is a novel genomic marker allowing estimation of biological characteristics of non-muscle-invasive bladder cancer.
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