Additionally, serum levels of carbohydrate-antigen 19-9 (CA19-9), neurone-specific enolase (NSE), alpha-fetoprotein (AFP), cytokeratin 19 fragment (CY211), carbohydrate-antigen 125 (CA125), carbohydrate-antigen 724 (CA724), prostate-specific antigen (PSA), and squamous cell carcinoma (SCC) were totally at normal levels (Table 1). Here, KLK3 is linked to squamous cell carcinoma.