ANO1 and gastrointestinal stromal tumor: GIST shows a lack of dilated capillaries in the pathological examination, and immunohistochemistry shows positive CD117, CD 34 and DOG-1 in tumor cells.[2,16] However, the results of GGT immunohistochemistry usually reveal positive vimentin, SMA, and negative CD 34, CD 117, DOG-1.