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By immunohistochemistry, the SMARCB1-deficient sinonasal adenocarcinomas were consistently negative for SMARCB1 (12 of 12 cases) with retained expression in benign lymphocytes and stromal cells (a), and positive for CK7 (11 of 12 cases) (b), but were otherwise highly variable, with occasional expression of CK20 (c), p40 (d), and other markers
