ANO1 and mesenchymal cell neoplasm: Our finding was also supported by Lee and his coauthors who reported that DOG1 immunoreactivity was rarely observed in other mesenchymal and non-mesenchymal tumors [26] with a negative to a very low false-positive rate less than 1% in non-GISTs [7, 23, 24, 29], suggesting that DOG1 is a highly specific and sensitive immunohistochemical marker of GISTs.