system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] If the mutations in Wade Wilsons (Deadpools) body were “Killing the cancer cells as fast as they can form”, how come Deadpool gets sick when the mutation disappears?

When the collar in the second movie is around his neck, how come he suddenly gets sick again from cancer? 

The mutation killed his cancer as fast as it could form, would it not have killed the original harmful cells? If so, why not? If he can regenerate limbs and whatnot, couldn’t he just cut out the cancerous cells and they would disappear? On that note he DID blow himself up to smithereens in a self destructive suicide attempt, and cancer isn’t coded into his original DNA, I would have thought the cancer would have been gone by now, replaced by healthy tissue.

Maybe cancer is somehow stronger than the mutation, but i’d have a hunch blowing yourself up to bits would be, too, and it wasn’t.
gpt
He's not invulnerable, he just heals rapidly.  Much like if he gets cut, shot, stabbed, etc.   The injury still exists... but his mutation allows for rapid healing from that injury.

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The mutation isnt a cure for cancer... it's a consistent "healing" that is going on to undo the damage the cancer is doing. -- The cancer and the mutation co-exist in an essential "stale mate" situation.

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Once you inhibit the mutation, the rapid healing stops.   The cancer can continue to do it's damage without him healing.