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Representative image of triple-negative breast cancer (A) hematoxylin-and-eosin-stained slide and the three degrees of major histocompatibility complex (MHC) class II expression in tumor cells. (B) No MHC-II expression and (C) lower and (D) higher expression than the mean value of the immunoreactive score, which was generated as the product of intensity and percentage of positively stained cells.
