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In this study, 44 primary or metastatic human ovarian tumours were tested for allelic deletions on the short arm of chromosome 11. Analysis of 12 polymorphic loci by Southern blotting evidenced loss of heterozygosity (LOH) in at least one locus in 41% of cases. Moreover, two hot spots of deletions were tentatively mapped on 11p13 and 11p15.5. Our results demonstrated that LOH at 11p is a common event in ovarian carcinomas and were indicative of the possible existence in 11p of two oncosuppressor genes involved in ovarian carcinogenesis. The similarity observed with 11p allelic losses in Wilms tumours, clustered in 11p13 and 11p15.5 too, suggests that deletion and possibly inactivation of the same growth regulatory genes (WT genes) could also contribute to development of the malignant phenotype in ovarian carcinomas. Finally, a statistically significant association (P = 0.005) between 11p deletions and hepatic involvement was suggested by the analysis of distribution of 11p LOH relative to different clinical and pathological parameters of the tumour patients.

Chromosomal localisation of two putative 11p oncosuppressor genes involved in human ovarian tumours