In our study, we described the demographical and clinical characteristics of patients with COVID-19 stratified by severity and assessed associations to infer the potential use of inflammatory cytokines (IL-2, IL-4, IL-6, IL-8, IL-10, TNF-α, GM-CSF, and IFN-γ) as biomarkers of COVID-19 pneumonia. This evidence concerns the gene IL6 and COVID-19.