Different proteins were expressed in different location of the cell, such as cytoplasm, membrane, nuclear [9,10].hK6 positive staining was mainly expressed in the cytoplasm of gastric cancer cells as brown or dark brown granules (Figure 1) also was observed in the adjacent noncancerous and gastric ulcer epithelial cells by immunohistochemistry. This evidence concerns the gene KLK6 and gastric ulcer.