Fig. 3From: Tumor-associated macrophages: an accomplice in solid tumor progressionMain roles of tumor-associated macrophages in tumorigenesis. Special markers and different factors derived from TAMs trigger multiple processes of tumor initiation and development. Schematic represents the impact of the tumor-associated macrophages (TAMs) in promoting tumor growth, angiogenesis, Treg cells induction, metabolic starvation of T cells, cancer stem cells induction, T cells inactivation, epithelial-mesenchymal transition (EMT), invasion, migration and metastasis. TAMs promote tumorigenesis by secreting some factors and expressing some proteins. For instance, epidermal growth factor, CSF-1 and MMPs secreted by TAMs promote tumor migration and invasion. TAMs promote angiogenesis and tumor growth by secreting VEGF and PDGFBack to article page