HNF1A and hepatocellular adenoma: Results of comprehensive molecular and immune–histological studies aided representative HCA subtype classification as follows: hepatocyte nuclear factor 1 homeobox A (HNF1A) inactivated (H-HCA), inflammatory HCA (I-HCA), β-catenin mutated (β-HCA or β-IHCA), and sonic hedgehog activated (sh-HCA) [1,3,4,5,6].