SMAD2 and hepatocellular carcinoma: Genetically, mutations in the genes, tumor protein P53 (TP53), catenin beta 1 (CTNNB1), AT‐rich interaction domain 1A (ARIC1A), cyclin dependent kinase inhibitor 2A (CDKN2A), mannose 6‐phosphate (M6P), smooth muscle action against decapentaplegic (SMAD2), retinoblastoma gene (RB1), cyclin D, antigen presenting cells (APC), AXIN1, and E‐cadherin, have been shown to contribute to the occurrence of HCC.