WWTR1 and cholangiocarcinoma: IHC stains followed by statistical comparison revealed that for nuclear YAP expression a significant correlation was detected in iCCA and dCCA samples (iCCA: r = 0.34, dCCA: r = 0.32; p ≤ 0.001), while no significant association was observed for TAZ in all CCA subtypes (Fig. 5a).