In the multivariate analysis, underweight based on new BMI (HR 5.285), age (HR 1.057), male sex (HR 3.595), BVAS (HR 1.161), FFS (HR 2.957), interstitial lung disease (HR 31.874), and serum albumin levels (HR 0.134) were independent predictors of all‐cause mortality. The gene discussed is ALB; the disease is interstitial lung disease.