Cancer cells walk this process back and stop being part of the collective and in some sense, become individuals again. And that would be OK in principle. Your body can handle a few cells doing their own thing and even live in harmony with them. But unfortunately cancer cells usually do not content themselves with doing their own thing, but divide and divide, again, and again. They turn from being an individual to a collective again. A sort of new organism within you. Still part of you but also not you at all. They take the resources you need to survive, destroying the organ systems they used
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