KRT18 and metabolic dysfunction-associated steatotic liver disease: This study is aimed at measuring the expression of serum cytokeratin 18 (CK18) in patients with nonalcoholic fatty liver disease (NAFLD) and at evaluating its ability to discriminate NAFLD patients with and without coronary heart disease (CHD), thereby elucidating its potential role in reflecting the link between NAFLD and increased cardiovascular involvement.