IL6 and lip and oral cavity carcinoma: 3.2. The Connection between the Tumor Necrosis Factor—Alpha (TNF-α), Interleukin-1β (IL-1β), Interleukin-6 (IL-6), Interleukin-8 (IL-8), Monocyte Chemoattractant Protein-1(MCP-1/CCL2), Macrophage, and Oral Cancer