Breast cancer tissue array without expressions of ER, PR, HER2 (triple negative), set 1, 96 cores, 48 cases containing at least five control cases with various levels of ER, PR, HER2, and 43 cases with no detectable expressions of these three markers. Since all the triple negative cases were selected out based on TMA screening, the IHC results only reflect the phenotypic status of individual cores tested at certain cutting level. We can not exclude the possibility that, at a late cutting level, a small fraction of the cores may be positive for one or more of these three markers.


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