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Abstract

The method of sub-classifying breast cancer tumors profiles the expression of the Raf kinase inhibitor protein (RKIP) from a tissue sample from a cancerous primary breast tumor. The RKIP expression is profiled using its mRNA or by immunohistochemical protein quantifying methods in order to detect the level of RKIP in the breast cancer tissue sample. Based upon the RKIP expression profile, a sub-classification of cancer type may then be assigned. An RKIP expression of approximately 10.31 indicates basal carcinoma, an RKIP expression of approximately 10.04 indicates Claudin-low carcinoma, an RKIP expression of approximately 10.47 indicates Luminal-A carcinoma, an RKIP expression of approximately 10.44 indicates Luminal-B carcinoma, an RKIP expression of approximately 10.25 indicates HER2+ carcinoma, an RKIP expression of approximately 10.43 indicates ER+ carcinoma, and an RKIP expression of approximately 10.30 indicates ER− carcinoma.

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