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ARID1A immunoreactivity in two representative atypical proliferative (borderline) seromucinous tumors. Both tumors show a characteristic morphological feature of a seromucinous tumor containing mixed serous and mucinous epithelium, forming complex papillary fronds. Tumor cells are negative for ARID1A staining but the tumor stromal cells are positive for ARID1A expression. Mutational analysis showed somatic ARID1A mutations in both tumors. A and B: SMBT-1; C and D: SMBT-2.
