MUC4 and cancer: Thus, MUC4 overexpression may also eventually serve as a diagnostic and prognostic marker for numerous cancers, including pancreatic tumours [144], where its expression is associated with the metastatic phenotype [145], lung adenocarcinomas [146], and mass-forming intrahepatic cholangiocarcinoma, where its co-expression with ErbB2 is correlated with a short survival time [147].