The FIB-4 index is calculated from the patients’ age and laboratory data of aspartate transaminase (AST), alanine transaminase (ALT), and platelets (PLT), and predicts liver fibrosis/cirrhosis confirmed by liver biopsy with an area under the curve (AUC) of 0.81, sensitivity of 0.57, and specificity of 0.89. This evidence concerns the gene GPT and Cirrhosis.