The TIME is made up of malignant cells, stomal cells and immune cells, all of which can suppress tumor directed immunity by acting directly or indirectly on effector T cells (Teff). Boxes depict select immunosuppressive mechanisms employed by these various cell types: cancer cells (Ca), regulatory T cells (Treg), dendritic cells (DC), macrophages (MΦ) and myeloid derived suppressor cells (MDSC; (Veglia et al., 2018)), and cancer associated fibroblasts (CAF).