Maybe try Healer Mech Serum?

If it does not work you can try installing mods to produce luciferium and use Luci Heals More mod: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=965087548

BUT YOUL NEED CONSTANT SUPPLY OF LUCIFERIUM AND CAREFUL ADMINISTRATION OTHERWISE IT KILLS THE COLONIST VERY EASILY.

Sorry for the caps, I don't want people to mess with luci without knowing what they are into.

There are a few mods that allow surgery on tumors. I use Carcinoma spreads and the standard bionics mods. one of them does it.

this is the only mod I have with cancer in it and i can just amputate what ever it is pair that with a organ with regeneration and there is no consequence