KLK6 and cancer: Indeed, recent studies have shown that the expression of many kallikreins including hK4, hK5, hK6, hK7, and hK8 has emerged as being related to breast, ovarian, and other human cancers (Underwood et al, 1999; Diamandis et al, 2000; Kim et al, 2001; Yousef et al, 2003).