Comprehensive allelotype study of ovarian tumors of low malignant potential: Potential differences in pathways between tumors with and without genetic predisposition to invasive carcinoma

Kentaro Nakayama, Yuji Takebayashi, Tsuneo Namiki, Nobuaki Tamahashi, Satoru Nakayama, Takahumi Uchida, Kohji Miyazaki, Manabu Fukumoto

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Ovarian tumors of low malignant potential (LMP) are intermediate between adenomas and ovarian carcinomas (OC); however, the relevance of LMP to ovarian carcinogenesis is not clear. We performed a comparative analysis of allelotypes in 50 cases of LMP (42 mucinous and 8 serous) and 23 cases of OC (15 mucinous and 8 serous) to investigate any differences in genetic changes. Analysis of loss of heterozygosity (LOH) using 25 microsatellite markers reportedly associated with OC revealed that the total LOH frequency at each marker was significantly lower in LMP than in OC (p < 0.0 1). However, 9 (36%) loci showed higher LOH frequency in mucinous LMP than in mucinous OC. A genome-wide scan for LOH using 91 microsatellite markers and fine mapping revealed that LOH at D7SI805 (7q35) is characteristic of mucinous LMP (19.4% in mucinous LMP, 8.3% in mucinous OC). We further studied LOH in 3 cases of mucinous OC that were accompanied by mucinous LMP lesions. In 2 cases, LOH frequency was higher in the carcinoma portion than in the morphologically LMP portion. The other case showed microsatellite instability in the morphologically LMP portion and LOH in the carcinoma portion. Our results suggest the presence of an LMP-to-OC developmental sequence and the existence of a subset of LMP that does not develop into OC in the mucinous subtype of ovarian tumors.

Original languageEnglish
Pages (from-to)605-609
Number of pages5
JournalInternational Journal of Cancer
Volume94
Issue number4
DOIs
Publication statusPublished - 2001 Nov 15

Keywords

  • Genome
  • Loss of heterozygosity (LOH)
  • Mutinous LMP
  • Ovarian carcinogenesis
  • Serous LMP

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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