If cancer can spread so easily throughout your body, why can’t it spread from person to person? Aka why isn’t it contagious?
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The same reason people who get organ transplants need to be on immunosuppressants the rest of their life. The immune system attacks what it sees to be a forgien body. Cancer cells are your own, so the immune system misses them. Your body usually kills what it determines to be cancer cells, but sometimes that system fails and your cancer goes unnoticed by your body.
There is exactly one known form of cancer that is contagious, and it only affects dogs. Canine transmissible venereal tumor (CTVT). This first formed thousands of years ago, and we have never seen anything else like it. We’re not even sure how to classify it because it works like a parasite, but its genome is made entirely of dog DNA.
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