KLK3 and ovarian cancer: Some other common oncofetal antigens that are used as biomarkers in oncology include cancer antigen 125 (CA125 or Mucin16) for ovarian cancer, the sialylated Lewis A antigen CA19-9 for pancreatic cancer, α-fetoprotein (AFP) for hepatocellular cancer and germ cell tumors and prostate-specific antigen (PSA) [62,63,64].