Our body’s immune system functions as a monitoring system to protect us against what it recognizes as foreign substances. For example, when our immune system detects harmful bacteria or a virus in our body, it reacts by producing specific proteins (antibodies) which will attack and destroy the invaders. Our immune system also treats cancer cells as foreign invaders, but due to some system failure it often does not recognize these cells. For years, researchers have been looking for ways to improve the body’s natural defense response to cancer cells.

Therefore, Immunotherapy in effect uses our immune system to attack and destroy cancer cells. It is a type of treatment that aims to modify the activity of the immune system and also to cause changes in the immune response to the tumor. It activates and directs the body’s immune system, to fight the growth of cancer cells.