HOXD13 and hepatocellular carcinoma: Plasma quartile levels of sPD-1 were positively associated with HCC risk for men in the case-cohort analysis (vs. quartile 1: adjusted odds ratios [95% confidence intervals] for quartile 2-quartile 4 were 1.51 [0.75–3.03], 2.15 [1.12–4.13], and 2.29 [1.20–4.38], respectively), and in the case-control study regardless of age-of-onset and clinical stage.