Abstract 5105: Genetic alterations of the metastatic lesions in ovarian carcinoma

• Published in: Cancer research (Chicago, Ill.) Vol. 72; no. 8_Supplement; p. 5105
• Main Authors: Malek, Joel, Mery, Eliane, George, Binu, Martinez, Alejandra, Thiery, Jean-Paul, Huang, Ruby, Querleu, Denis, Rafii, Arash
• Format: Journal Article
• Language: English
• Published: 15.04.2012
• ISSN: 0008-5472; 1538-7445
• DOI: 10.1158/1538-7445.AM2012-5105

Abstract Background: Ovarian cancer is the most deadly gynecological cancer. The high rate of mortality is due to the large tumor burden with extensive metastatic lesion of the abdominal cavity. There are few studies on genetic alterations and their consequences in peritoneal metastatic tumors when compared to their matched ovarian primary tumors. Our hypothesis is that differences between the metastatic and primary lesions might be the cause of residual disease and, most importantly may have a role in post-chemotherapeutic recurrences. Methods: We conducted integrated genomics analysis on matched primary and metastatic tumors from 9 patients. In the papers presented here we analyze genome-wide Copy Number Variations (CNVs) using SNP Arrays targeting peritoneal metastasis differences, Gene expression differences using Microarrays also targeting peritoneal metastasis differences, and for some patients, Single Nucleotide Polymorphisms (SNPs) in genes through Exome sequencing. Results: Here we show that CNVs vary significantly between primary and metastatic tumors and include genes that have been considered potential chemotherapeutic targets based on primary tumor only data. Gene expression differences, while minor, showed highly statistically significant enrichment of genes in ovarian cancer critical pathways. In agreement with findings in other cancers, exome sequencing data revealed very few SNP differences of which most metastasis enriched SNPs were present at very low levels in the primary tumor. The results presented here should allow better design of therapies to target residual ovarian cancer disease. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 5105. doi:1538-7445.AM2012-5105