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Genetic alterations on chromosome 17 in human breast cancer: relationships to clinical features and DNA ploidy

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Summary

We analyzed DNA from 105 primary breast cancers to assess amplification of the ERBB2 gene and loss of heterozygosity (LOH) on chromosome 17 using 4 polymorphic markers, and investigated the relationships of these genetic alterations to clinicopathological characteristics including DNA ploidy. Amplification of the ERBB2 gene was observed in 28% of the tumors. ERBB2 was amplified in tumors of all clinical stages and amplification was significantly linked to lymph node metastasis. LOH atD17S5 was observed in 28 of 57 informative tumors, while 17 of 62 informative tumors showed allelic loss atTP53. Among the 37 tumors informative for both loci, 32% showed LOH at these loci and 49% retained both alleles, indicating that there was a significant relationship between LOH atD17S5 and atTP53. We also examined LOH at theD17S74 andNME1 loci on chromosome 17q. LOH atD17S74 andNME1 was observed in 20% and 22% of the informative tumors, respectively, but there was no significant association between LOH at these loci. Of the 4 loci tested, LOH atTP53, D17S74, andNME1 was associated with clinical stage. Lymph node metastasis was correlated with LOH atNME1. Moreover, allelic loss was more frequent in aneuploid tumors than in diploid tumors. These results suggest that certain combinations of genetic alterations on chromosome 17 may cooperate in the development and/or progression of breast cancer. Furthermore, it seems likely that analysis of these alterations in breast cancer patients may provide useful prognostic information.

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Authors and Affiliations

  1. First Department of Surgery, Kinki University School of Medicine, 377-2 Oono-higashi, 589, Osaka-Sayama, Japan

    Masahiro Watatani, Koichi Nagayama, Yukio Imanishi, Kazuyoshi Kurooka, Tomio Wada, Hiroki Inui, Kyoko Hirai, Masatoshi Ozaki & Masayuki Yasutomi

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  1. Masahiro Watatani
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  2. Koichi Nagayama
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  3. Yukio Imanishi
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  4. Kazuyoshi Kurooka
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Watatani, M., Nagayama, K., Imanishi, Y. et al. Genetic alterations on chromosome 17 in human breast cancer: relationships to clinical features and DNA ploidy. Breast Cancer Res Tr 28, 231–239 (1993). https://doi.org/10.1007/BF00666584

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