How does the immune system protect us from cancer?

The immune system protects the body from outside invasion by locating and destroying potentially harmful bacteria and viruses. It does so through the workings of certain cells and signaling processes in the immune system that identify and destroy potentially hazardous toxins and invading organisms. Some of these cells are called "proofreader genes," and they exist in every cell except red blood cells.

Proofreader genes protect the body against insurrection from within by rooting out cells that have become abnormal or malignant. They do this by scanning the rest of your genes and destroying cells that contain an error or a change in your deoxyribonucleic acid (DNA). In this way, the immune system helps keep bad collections of cells (an initial "tumor") from growing into a clinical cancer.

(A clinical cancer is one that has become apparent in some way -- for example, by causing symptoms or as the result of physical examination or laboratory test.).

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