Abstract
We have investigated deletions of 3p14, 9p21, 9q34, 17p13 (TP53) loci, activating FGFR3 mutations in exon 9 and aberrant methylation of RASSF1, RARbeta, P16, P14, CDH1 genes with the aim of the molecular pathogenesis pathways analysis of bladder cancer. FGFR3 activating mutations and 9p21 deletions were observed significantly more frequent in the group of non-invasive bladder cancer pTa than in minimally-invasive cancers pT1 (p = 0.004 and 0.006 respectively). It was shown that groups of superficial and invasive bladder cancer are significantly differing in the frequency of 17p13 (p = 0.006) and 9q34 (p = 0.04) deletions and in aberrant methylation of the gene P16 (p = 0.02). We have revealed some differing molecular-genetic alterations in groups of superficial and invasive bladder cancers. Therefore we suppose that these two types of bladder cancer might have different pathways of development.
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