Pseudoangiomatous Stromal Hyperplasia

A benign proliferation of the stromal cells in the breast. It is classified as simple, when associated with the presence of slit-like spaces without erythrocytes and as fascicular/proliferative, when spindle cell proliferation without atypia is present. It is often seen in breast tissue specimens as small foci associated with benign epithelial lesions. Pseudoangiomatous stromal hyperplasia presenting as a well-circumscribed palpable mass is rare. (NCI Thesaurus)

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Method for identifying invariant set normalization baseline using psuedo median expression values. Defined in the documents available at http://bioconductor.org/packages/1.9/bioc/html/affy.html.

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This gene plays a role in the regulation of both gamma-secretase activity and Notch signaling pathways.

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