Abstract
Heterozygous loss of the TP53 gene on chromosome arm 17p in colorectal carcinomas was strongly associated with DNA aneuploidy (P < 0.0001). This association was seen only in tumours with loss on both 17p and 17q (P < 0.001), but not for loss on 17p only. DNA near diploid (ND) carcinomas and DNA aneuploid (AN) tumours with DNA index > or = 1.1 and < 1.3 had similar frequencies of TP53 gene loss (49% and 42%, respectively), whereas AN tumours with DNA index > or = 1.3 had a significantly higher frequency of TP53 gene loss (85%) (P < 0.0001 and P < 0.0001, respectively). There was a significant association between loss of the TP53 gene and histological grade (P < 0.01), and there tended to be an association between loss of the TP53 gene and degree of cellular atypia (P < 0.05), with TP53 gene loss being most frequent in moderately differentiated carcinomas, and in carcinomas with severe cellular atypia, respectively. The proportion of tumours with loss of the TP53 gene increased significantly towards the distal part of the large bowel (P < 0.0001). These results indicate that different genetic mechanisms may be involved in the carcinogenesis in colon and rectum carcinomas, and in the two subsets of DNA aneuploid carcinomas. Furthermore, the data may suggest a role for the TP53 gene in the aneuploidisation process, possibly as a 'target' for a whole chromosome loss.
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