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Bladder tumors in patients younger than 20 years show a low incidence of the genetic and epigenetic aberrations typically found in older patients. One of the most common epigenetic aberrations in human malignancies is DNA hypermethylation. Polycomb group complexes have an important role during lineage choices in embryogenesis and their target genes are 12 times more likely to be methylated than nonpolycomb...
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