Current HCA classification includes six molecular subtypes of HCA: HNF1A-inactivated HCA (H-HCA), inflammatory HCA (I-HCA), β-catenin exon 3 mutated HCA (bex3HCA), β-catenin exon 7/8 mutated HCA (bex7,8HCA), Sonic Hedgehog activated HCA (shHCA), and a further approximately 10% unclassified HCA (U-HCA). Here, HNF1A is linked to hepatocellular adenoma.