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Somatic allelic loss is regarded as a hallmark of tumour-suppressor gene (TSG) inactivation. Thirty-one human bladder transitional cell carcinomas (TCCs) were examined for allelic loss at five chromosome 18q loci, including the DCC gene (deleted in colorectal carcinoma) and at chromosome 11p15 in a restriction fragment length polymorphism analysis. Allelic loss was observed at one or more 18q loci in 9/26 (35%) samples, associated with muscle-invasive disease (P &lt; 0.02). Allelic loss was observed at DCC in 8/24 (33%) samples, associated with muscle-invasive disease (P = 0.05). Three out of the five evaluable recurrent TCCs exhibited allelic loss at DCC, two of which were superficial. No allelic losses were detected at other 18q loci in tumours which retained both DCC alleles. Allelic loss was observed at 11p15 in 5/20 (25%) tumours. These data suggest the presence of a late-acting TSG located on 18q in TCC bladder cancer. DCC is a candidate gene since it lies within the region of most common deletion (18q21.3-qter).

Loss of heterozygosity on chromosome 18q is associated with muscle-invasive transitional cell carcinoma of the bladder