FOLR1 and intrahepatic cholangiocarcinoma: However, the results of qRT–PCR demonstrated that FOLR1 was overexpressed in RBE cells than mice primary hepatocytes and Kupffer cells (Figure S6A, Supporting Information), and study has reported that polyethylene glycol (PEG) and folate could reduce phagocytosis by macrophages and effectively target ICC cells.[35]