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2004: Jones Chris; Mackay Alan; Grigoriadis Anita; Cossu Antonio; Reis-Filho Jorge S; Fulford Laura; Dexter Tim; Davies Susan; Bulmer Karen; Ford Emily; Parry Suzanne; Budroni Mario; Palmieri Giuseppe; Neville A Munro; O'Hare Michael J; Lakhani Sunil R
Expression profiling of purified normal human luminal and myoepithelial breast cells: identification of novel prognostic markers for breast cancer.
Cancer research 2004;64(9):3037-45.
The normal duct-lobular system of the breast is lined by two epithelial cell types, inner luminal secretory cells and outer contractile myoepithelial cells. We have generated comprehensive expression profiles of the two normal cell types, using immunomagnetic cell separation and gene expression microarray analysis. The cell-type specificity was confirmed at the protein level by immunohistochemistry in normal breast tissue. New prognostic markers for survival were identified when the luminal- and myoepithelial-specific molecules were evaluated on breast tumor tissue microarrays. Nuclear expression of luminal epithelial marker galectin 3 correlated with a shorter overall survival in these patients, and the expression of SPARC (osteonectin), a myoepithelial marker, was an independent marker of poor prognosis in breast cancers as a whole. These data provide a framework for the interpretation of breast cancer molecular profiling experiments, the identification of potential new diagnostic markers, and development of novel indicators of prognosis.

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