The immune system can identify and destroy nascent tumor cells in a process termed cancer
immunosurveillance, which functions as an important defense against cancer. Recently,
data obtained from numerous investigations in mouse models of cancer and in humans with
cancer offer compelling evidence that particular innate and adaptive immune cell types,
effector molecules, and pathways can sometimes collectively function as extrinsic tumor-
suppressor mechanisms. However, the immune system can also promote tumor …