VEGFA and COVID-19: Several studies have found that serum cytokines in patients with COVID-19 are significantly increased, including IL-1, IL-6, IL-7, IL-8, IL-9, IL-10, granulocyte colony-stimulating factor (G-CSF), granulocyte-macrophage colony-stimulating factor (GMCSF), chemokines (CXCL10, CCL2, CCL3), IFN-γ, TNF-α and vascular endothelial growth factor (VEGF) [36,37,38].