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Proteomic Characterization of Nipple Aspirate Fluid: Identification of Potential Biomarkers of Breast Cancer

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Abstract

Mammary ductal cells are the origin for 70–80% of breast cancers. Nipple aspirate fluid (NAF) contains proteins directly secreted by the ductal and lobular epithelium in non-lactating women. Proteomic approaches offer a largely unbiased way to evaluate NAF as a source of biomarkers and are sufficiently sensitive for analysis of small NAF volumes (10–50 µl). In this study, we initially evaluated a new process for obtaining NAF and discovered that this process resulted in a volume of NAF that was suitable for analysis in ∼90% of subjects. Proteomic characterization of NAF identified 64 proteins. Although this list primarily includes abundant and moderately abundant NAF proteins, very few of these proteins have previously been reported in NAF. At least 15 of the NAF proteins identified have previously been reported to be altered in serum or tumor tissue from women with breast cancer, including cathepsin D and osteopontin. In summary, this study provides the first characterization of the NAF proteome and identifies several candidate proteins for future studies on breast cancer markers in NAF.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, Richland, WA, USA

    Susan M. Varnum, Ronald L. Woodbury, Konstantinos Petritis, Lars J. Kangas, Joel G. Pounds, Richard D. Smith & Richard C. Zangar

  2. University of California School of Nursing, Los Angeles, CA, USA

    Chandice C. Covington

  3. National Health Research & Development Center, Nairobi, Kenya

    Mohamed S. Abdullah

Authors
  1. Susan M. Varnum
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  2. Chandice C. Covington
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  3. Ronald L. Woodbury
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  4. Konstantinos Petritis
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  8. Richard D. Smith
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  9. Richard C. Zangar
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Varnum, S.M., Covington, C.C., Woodbury, R.L. et al. Proteomic Characterization of Nipple Aspirate Fluid: Identification of Potential Biomarkers of Breast Cancer. Breast Cancer Res Treat 80, 87–97 (2003). https://doi.org/10.1023/A:1024479106887

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