The authors also identified six COVID-19-related discriminant cytokines including Interleukins (IL)-2, 5, 6, Granulocyte colony-stimulating factor (GCSF), Tumor necrosis factor-α (TNF- α), and Interferon-γ (IFN- γ), but only IL-12 for controls. This evidence concerns the gene CSF3 and COVID-19.