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(A) Representative hematoxylin and eosin-stained photomicrograph of ACC. (B–G) Immunohistochemical analyses of protein expression in resected ACC. (B) PD-L1 expression in tumor cells was <1%. The tumor did not express (C) MSH2 or (E) MSH6 but expression of (D) MLH1, (F) PMS2, and (G) β2-microglobulin was preserved (scale bar = 200 µm).
