In addition, there were higher correlations between IL-2 and IL-4, TNF-α and IL-2, TNF-α and IL-4, TNF-α and IFN-γ, and NK cells and T cells in COVID-19 patients, and there was a higher correlation between CD3+CD4+ T cells and CD19 + T cells in cancer patients. The gene discussed is CD19; the disease is cancer.