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From the Institute of Pathology*
and Urologic
Clinics,
University of Basel,
Basel, Switzerland
To identify genetic changes linked to bladder cancer progression we analyzed 90 invasive transitional cell carcinomas (37 pT1 and 53 pT2–4) by comparative genomic hybridization. The most frequent alterations included 1q+ (37%), 5p+ (24%), 6q- (19%), 8p- (29%), 8q+ (37%), 9p- (31%), 9q- (23%), 11p- (24%), 11q- (22%), 17q+ (29%), and 20q+ (28%). Interestingly, there were three groups of alterations that frequently occurred together (9p- and 11q13+/20q+ and 11q13+ or 17q+/1q+ and 3p+ or 11q-). These loci might carry genes that interact with each other in specific molecular pathways. There were remarkable genetic similarities between minimally and deeply invasive tumors of different histological grades, including a similar number of aberrations per tumor and an equal frequency of most individual alterations. However, deletions of 5q, 6q, and 15q and gains of 5p, 7p, and Xq were significantly more frequent in pT2–4 than in pT1 carcinomas. These loci may harbor genes that are important for bladder cancer progression.
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