Many studies have reported that KLK7 is overexpressed in healthy tissue than in tumors of ovarian cancer patients and have linked with the some other diseases [20,21] We first systematically analyzed the expression of KLK7 in different cancers using ONCOMINE, and our results confirmed that KLK7 was overexpressed in ovarian cancer, colorectal cancer and gastric cancer. Here, KLK7 is linked to gastric cancer.