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Differential expression of NY-BR-1, estrogen receptor (ER), EGFR and HLA class I heavy chain in breast carcinoma lesions by immunohistochemistry using mAbs. The staining for NY-BR-1 was nuclear/cytoplasmic, for ER nuclear, for EGFR membraneous/cytoplasmic and for HLA class I predominantly membranous. Only stromal and inflammatory cells were stained in negative tumor lesions
