XPNPEP1 and liver cancer: Among the 28 unique proteins of the liver tumour model, five proteins have been reported to be associated with liver cancer, including serum amyloid P component (SAMP), alpha-l-fucosidase (AFU), urokinase-type plasminogen activator (UROK), peroxiredoxin 6 (PRDX6), and peroxiredoxin 1 (PRDX1).