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Expression of (A) Ki-67 in invasive, (B) Ki-67 in noninvasive, (C) cytokeratin 17 (CK17) in invasive, and (D) CK17 in noninvasive cholesteatoma. Overexpression of Ki-67 is observed in the invasive group as compared to the noninvasive one (arrows). The same is true for CK17 (arrows) (Mayer’s hematoxylin, ×200).
