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Genomic DNA analysis of the estrogen receptor gene in breast cancer

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Summary

A human estrogen receptor (ER) cDNA probe was used to examine genomic DNA extracted from 59 primary invasive breast cancers. The tumors were also studied histopathologically, and their ER status was assessed by hormone-binding assay and immunohistochemical analysis. Southern blots of genomic DNA samples digested with restriction endonucleases (BamHI, EcoRI, HindIII, PvuII, XbaI) revealed identical restriction fragments for each tumor, indicating preservation of gross ER gene integrity regardless of ER status, clinical stage, or histopathologic appearance. Digestion with PvuII identified a single, two-allele polymorphism with band(s) at 1.6 and/or 0.7 kb. The homozygous 1.6 kb pattern was present in 14 (24%) patients, the heterozygous 1.6/0.7 kb pattern in 29 (49%) patients and the homozygous 0.7 kb pattern in 16 (27%) patients. The PvuII restriction fragment length polymorphism (RFLP) within the ER gene showed no correlation with the results of the ER binding assay, the immunohistochemical analysis, clinical stage, or histopathologic appearance. A significant correlation was found between the genotypes and patient age at the time of tumor diagnosis. Tumors with the homozygous 1.6 kb and the heterozygous 1.6/0.7 kb patterns were observed in older women with mean ages of 64.6 and 64.4 years, respectively. In contrast, patients with tumors containing the homozygous 0.7 kb pattern were significantly younger, with a mean age of 50.4 years (p-value = 0.0024). The mechanism by which the homozygous 0.7 kb genotype is associated with breast cancer in the premenopausal age group is unknown.

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Authors and Affiliations

  1. Department of Pathology, Molecular Biology, Vanderbilt University, School of Medicine, 37232, Nashville, TN, USA

    Fritz F. Parl & Douglas R. Cavener

  2. Department of Pathology, Preventive Medicine, Vanderbilt University, 37232, Nashville, Tennessee, USA

    William D. Dupont

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  1. Fritz F. Parl
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  2. Douglas R. Cavener
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  3. William D. Dupont
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Parl, F.F., Cavener, D.R. & Dupont, W.D. Genomic DNA analysis of the estrogen receptor gene in breast cancer. Breast Cancer Res Tr 14, 57–64 (1989). https://doi.org/10.1007/BF01805976

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