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Slug IHC: Slug, immunohistochemical reaction in HNC was categorized and scored into (A): absent (0), (B): scattered weak reaction (1+), (C): focal strong reaction (2+) and (D): generalized strong reaction (3+). Images were taken in the TissueFaxs system, bars: 50 µm. With this classification, Slug positive cells in the tumor stroma are not counted.
