KL and atherosclerosis: Receiver operating characteristic analysis pointed to the utility of serum Klotho (area under the curve [AUC]: 0.817, 95% CI: 0.736–0.898, P < 0.001) and its gene expression in PBCs (AUC: 0.742, 95% CI: 0.647–0.836, P < 0.001) to distinguish subclinical atherosclerosis.