Previous studies have demonstrated that increased expression of the granulocyte-macrophage colony-stimulating factor (GM-CSF) correlated with poor prognosis in patients with cholangiocarcinoma (CCA) and pancreatic ductal adenocarcinoma (PDAC). In the current study, a research team at the University of Rochester Medical Center aimed to assess the impact of blocking GM-CSFR signaling in CCA and PDAC.