Frequent loss of heterozygosity on chromosomes 7 and 9 in benign epithelial ovarian tumours.

Abstract:

:It is presently unclear if ovarian cancers arise through malignant transformation of pre-existing benign tumours. The apparent rarity of loss of heterozygosity (LOH) reported for benign tumours has led to speculation that they lack malignant potential and represent a biological entity distinct from ovarian carcinoma. We reasoned that the absence of detectable LOH may be due to the masking of such losses by contamination with normal tissue present in excess in the majority of benign tumour biopsies. Therefore we utilized a microdissection technique to examine for LOH using 14 microsatellite markers on chromosome arms 6q, 7p, 7q, 9p, 11q and 17p in 31 solitary benign epithelial ovarian tumours. LOH was detected on all chromosome arms with the most frequent LOH occurring on 7p (27%) and 9p (26%). In addition, a point mutation in codon 157 of TP53 was detected in one tumour which is the first report of a TP53 mutation in a solitary benign ovarian tumour. In total 48% of tumours harboured genetic alterations which supports the idea that all benign ovarian tumours may carry a genetic predisposition to malignancy and are therefore not inherently different from their malignant counterparts.

journal_name

Oncogene

journal_title

Oncogene

authors

Roy WJ Jr,Watson RH,Hitchcock A,Campbell IG

doi

10.1038/sj.onc.1201372

subject

Has Abstract

pub_date

1997-10-23 00:00:00

pages

2031-5

issue

17

eissn

0950-9232

issn

1476-5594

journal_volume

15

pub_type

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