HGF and squamous cell carcinoma: Squamous cell carcinoma of the larynx – relevant cytokines and their cellular functions HGF: Hepatocyte growth factor, MIF:Macrophage migration inhibitory factor, PDGF: Platelet–derived growth factor, PG: prostaglandin, TGF–beta:Transforming growthfactor, VEGF:Vascular endothelial growth factor, bFGF basic fibroblast growth factor, GM–CSF: granulocyte macrophage colony stimulating factor.