The second edition of this dataset (2012) incorporates the changes to the classification of liver and bile duct cancers introduced in TNM 7th edition, 2009. The section on intrahepatic cholangiocarcinoma is new in this version of the TNM classification. Gall bladder cancer was not
previously covered by a College dataset and, since surgery for cancers of stage 1b (into the muscle wall) and above may require liver resection, they are now included here. Changes to the TNM staging of hepatocellular carcinoma and perihilar cholangiocarcinoma are also included.