Radiotherapy (RT) is one of the most important treatment options of cancer and also may activate the immune response. Because of this, we must discuss the question of "is the radiotherapy vaccine". If RT increases the immune response we must learn some more about the RT effects on the cells, cell surface antigene, immune checkpoints and their inhibition (ICI; CTLA4, PD1, PDL1 inhibition). It will be discussed the role of the radiotherapy and biologic effects of the radiotherapy to activate the immune response, radiotherapy dose, radiotherapy timing and the side effects of immune checkpoints inhibitors. Hypofractionated stereotactic body radiotherapy is widely used in clinical practice to achieve immune response, but with high conformal hypofractionated stereotactic radiotherapy the microenvironment around the cancer tissue such as fibroblast may survive and then may help cancer stem cells progression, and this is a very important subject should be taken into consideration in order to be better understood in future studies.
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