Figure 1: Components of the tumor microenvironment.
The tumor microenvironment is a complex network of stromal cells (fibroblasts, endothelial cells, lymphocytes, macrophages, and myeloid-derived suppressor cells), and other acellular entities surrounding the tumor cells. Tumor and stromal cells actively interact and influence each other to support tumor growth by promoting desmoplasia, angiogenesis, and immune suppression.