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[Cancer Research 60, 5371-5375, October 1, 2000]
© 2000 American Association for Cancer Research

Advances in Brief

17q23 Amplifications in Breast Cancer Involve the PAT1, RAD51C, PS6K, and SIGMA1B Genes1

Guo-Jun Wu, Colleen S. Sinclair, John Paape, James N. Ingle, Patrick C. Roche, C. David James and Fergus J. Couch2

Departments of Laboratory Medicine and Pathology [G-J. W., C. S. S., J. P., P. C. R., C. D. J., F. J. C.], Biochemistry and Molecular Biology [F. J. C.], and Oncology [J. N. I.], Mayo Clinic and Foundation, Rochester, Minnesota 55905

Amplification of the 17q23 region occurs frequently in breast tumors. To characterize the structure of 17q23 amplicons and to identify oncogene targets associated with this alteration, we performed a copy number analysis of 87 17q23 localized expressed sequence tags in seven breast cancer cell lines. Three major regions of amplification were detected in the MCF7 and BT474 cell lines. Amplification of at least one of four known genes (PAT1, PS6K, RAD51C, and SIGMA1B) was detected in the cell lines and in 28% of 94 breast tumors. In most cases, these four genes were overexpressed when amplified, but there was a particularly good association between amplification of the SIGMA1B gene and elevated expression in tumors, which suggested a possible role for this gene in tumor progression. Our data show that this region contains at least four independent targets of amplification, which suggests that there is considerable variability in the structure of the 17q23 amplicon.




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