The immune system is a complex network of cells and organs that work together to defend the body against attacks by “foreign” or “non-self” invaders. This network is one of the body’s main defenses against infection and disease. The immune system works against diseases, including cancer, in a variety of ways.

For example, the immune system may recognize the difference between healthy cells and cancer cells in the body and works to eliminate cancerous cells. However, the immune system does not always recognize cancer cells as “foreign.” Also, cancer may develop when the immune system breaks down or does not function adequately. Biological therapies are designed to repair, stimulate, or enhance the immune system’s responses.

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