IL4 and neoplasm: In addition, mast cells may promote inflammation, inhibition of tumor cell growth, and tumor cell apoptosis by releasing interleukin (IL)-1, IL-4, IL-6, IL-8, monocyte chemotactic protein-3 and-4 (MCP-3 and MCP-4), transforming growth factor beta (TGF-β), and chymase [1].