© 2002 by Oxford University Press
Journal of the National Cancer Institute, Vol. 94, No. 13, 990-1000,
July 3, 2002
© 2002 Oxford University Press
ARTICLE |
Gene Expression Profiles of BRCA1-Linked, BRCA2-Linked, and Sporadic Ovarian Cancers
Affiliations of authors: A. A. Jazaeri, C. Sotiriou, K. R. Brantley, E. T. Liu, Division of Clinical Sciences of the National Cancer Institute, Gaithersburg, MD; C. J. Yee, J. Boyd, Departments of Surgery and Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY.
Correspondence to: Edison T. Liu, M.D., Genome Institute of Singapore, Capricorn Bldg., 1 Science Park Rd., Science Park II, Singapore 117604 (e-mail: gisliue{at}nus.edu.sg).
Background: Germline mutations in BRCA1 and BRCA2 are responsible for 5%–10% of epithelial ovarian cancers, but the molecular pathways affected by these mutations are unknown. We used complementary DNA (cDNA) microarrays to compare gene expression patterns in ovarian cancers associated with BRCA1 or BRCA2 mutations with gene expression patterns in sporadic epithelial ovarian cancers and to identify patterns common to both hereditary and sporadic tumors. Methods: Tumor samples from 61 patients with pathologically confirmed epithelial ovarian adenocarcinoma with matched clinicopathologic features were studied, including 18 with BRCA1 founder mutations, 16 with BRCA2 founder mutations, and 27 without either founder mutation (termed sporadic cancers). The cDNA microarrays contained 7651 sequence-verified features. Gene expression data were analyzed with a modified two-sided F test, with P<.0001 considered statistically significant. The expression level of six genes was also studied with reverse transcription–polymerase chain reaction. Results: The greatest contrast in gene expression was observed between tumors with BRCA1 mutations and those with BRCA2 mutations; 110 genes showed statistically significantly different expression levels (P<.0001). This group of genes could segregate sporadic tumors into two subgroups, "BRCA1-like" and "BRCA2-like," suggesting that BRCA1-related and BRCA2-related pathways are also involved in sporadic ovarian cancers. Fifty-three genes were differentially expressed between tumors with BRCA1 mutations and sporadic tumors; six of the 53 mapped to Xp11.23 and were expressed at higher levels in tumors with BRCA1 mutations than in sporadic tumors. Compared with the immortalized ovarian surface epithelial cells used as reference, several interferon-inducible genes were overexpressed in the majority of tumors with a BRCA mutation and in sporadic tumors. Conclusions: Mutations in BRCA1 and BRCA2 may lead to carcinogenesis through distinct molecular pathways that also appear to be involved in sporadic cancers. Sporadic carcinogenic pathways may result from epigenetic aberrations of BRCA1 and BRCA2 or their downstream effectors.
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