eli5: How Does Cancer Kill? And How Does Radiation Stop Cancer?

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Throughout my entire life I’ve always recognize how bad Cancer is, and I’ve always been told that Chemo was a way to cure it. I am aware that cancer is a mutation of cells. But how do stuff like tumours lead to death?

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3 Answers

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In basic terms, cancer cells kill because they grow out of control and eventually take over an organ and spread to other organs and affect their function. Radiation kills cancer cells by damaging their DNA. Normal cells can be affected by radiation too, but cancer cells are especially susceptible to damage compared to normal cells due to the fact that they divide/grow quickly.

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