KLK5 and ovarian cancer: Seven KLKs (KLK5–8, 10, 11 and 14) are released into the blood, six of these KLKs are also released into peritoneal ascitic fluid (KLK5, 7, 8, 10, 11 and 14) of ovarian cancer patients.41–48 KLK proteins released into the blood or ascitic fluid may also predict the course of early and/or late stage ovarian cancer.