As far as I know, not a medical professional at all though.
Cancer cells are just normal cells gone rogue. They switched on their replicating button, and forgot how to switch it off. So they just continue to grow and spread throughout your system.
They don’t have a purpose. They just do, because they don’t know how to stop doing.
This is probably not all cancer cells, and would probably only be applicable to malignant cancer cells.
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