Résumé
PURPOSE: Cytogenetic and genetic alterations of tumors are closely related with progressian and promotion of cancers. Comparative genomic hybridization (CGH) has known to be a novel tool for the detection of genetic alteration in solid cancers. We performed CGH for the detection of new genetic alterations of bladder tumors. MATERIALS AND METHODS: Biotin-labeled tumor DNA and digoxigenin-labeled normal DNA were hybridized to normal metaphase cells. The fluorescence signals were captured by fluorescence microscope after detection by avidin FITC and antidigoxigenin rhodamin. Then, the ratio of fluorescence was calculated by an image analyzer. RESULTS: CGH results showed amplifications on chromosomes 1q, 3q, 4q, 5p, 6pq, 7p, 8q, 11q, 12q, 13q, 17q, 18q and 20pq (more than 20% of cases). Deletions were on chromosome 2q21-qter, 4q13-q23, 5q, 8p12-p22, 9pq, 11p13-p15 (more than 20% of cases). High level amplifications were noted on chromosomes 1q31-qter, 3p21, 3q24, 4q26, Sq21-qter, llq14-qter, 12q15-q21, 12q21-q24, 13q21-q31, 17q22, 18q22. CONCLUSION: We considered that the amplification on chromosome 4q26, 11q14-qter, 12q21-q24, 18q12 and deletion on 4qll-4q13 as a novel genetic alterations of bladder cancer. Our results revealed different pattem of amplifications that affect other regions from previous study on chromosome 7, llq, 12q, 13q, and 18q. CGH was very useful for the screening of genetic alterations of solid tumors.