PDGFRB and cholangiocarcinoma: These findings are consistent with a previous report demonstrating that pharmacological inhibition of PDGFRβ or PDGFRβ siRNA silencing decreased levels of YAP Ser127 and induced YAP translocation to the cytoplasm in cholangiocarcinoma cells (Smoot et al., 2018), suggesting a distinct role for PDGF signaling in regulating YAP activation.