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American Journal of Pathology, Vol 150, 1465-1471, Copyright © 1997 by American Society for Investigative Pathology

REGULAR ARTICLES

Genetic changes in intraductal breast cancer detected by comparative genomic hybridization

T Kuukasjarvi, M Tanner, S Pennanen, R Karhu, OP Kallioniemi and J Isola
Department of Pathology, Tampere University Hospital, University of Tampere, Finland.

Ductal carcinoma in situ (DCIS) is considered a direct precursor of invasive ductal breast cancer (IDC). We combined tissue microdissection and comparative genomic hybridization to identify genetic changes in five DCIS lesions with no invasion and in two that were adjacent to IDC. Extensive genetic changes characterized pure DCIS cases with gains of 1q, 6q, 8q, and Xq as well as losses of 17p and chromosome 22 being most often involved. Except for the Xq gain, these changes are also common to IDC. Separate analysis of DCIS and IDC components in the same tumor revealed an almost identical pattern of genetic changes in one case, whereas substantial differences were found in another. We conclude that many of the common genetic changes in IDC may take place before development of invasive growth. However, a simple linear progression model may not always account for the DCIS-IDC transition.

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