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Because cancer is not bacterial or viral. It is caused by your body's own mutated cells that grow out of control, like weeds that kill off other plants. If any cell material from somebody else entered your body your immune system would try to kill it off which is why heart transplants reqiure anti rejection drugs. I'm not a medical guy but that's my understanding from what I have seen on TV programmes, talking to doctors etc.

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15y ago

What else can I help you with?