Fig. 5
From: Peritumoral ductular reaction can be a prognostic factor for intrahepatic cholangiocarcinoma
PI in the different peritumoral DR groups and tumor group. a CK19/PCNA positive expression in the mild and obvious peritumoral DR group and tumor group. b The obvious peritumoral DR group indicated a higher PI trend of ductular cells compared with the mild peritumoral DR group, and tumor group showed much higher PI compared with the other two groups. [PI = number of PCNA-positive (arrow)/total number of reactive ductular/tumor cells]