Anaemic patients with comorbidities (type 2 diabetes mellitus, hypertension, chronic obstructive pulmonary disease) had significantly higher IL-6 concentrations (x ̄=46.33 pg/mL) than anaemic patients without comorbidities (x ̄=21.92 pg/mL) (p = 0.005271). This evidence concerns the gene IL6 and chronic obstructive pulmonary disease.