IL10 and neoplasm: In a mouse model of Lewis lung cancer, tumor cell secretion of macrophage colony-stimulating factor-induced FASN upregulation in M2 TAMs activated tumor myeloid cells to express PPARβ/δ, leading to increased release of immunosuppressive cytokines such as IL-10 and arginase I (Arg I), ultimately promoting tumor cell invasion and angiogenesis [20].