PDGFRB and cholangiocarcinoma: As expected, PDGF-BB dramatically improved the clonal formation, proliferation, and migration abilities of PDGFR-β-positive (HuCCT1 and QBC939), but not PDGFR-β-negative, CCA cell lines (Huh28, HCCC-9810, and ZJU-1125) in a concentration-dependent manner (Supplementary Fig. 7A-E).