Not that I would be an expert, but limbs start forming so early on in the womb, that that will probably be a very difficult thing to do. Nevertheless, never say never.

Finally we can all become Deadpool

Axolotls actually have unusally low cancer rates despite their regenerative abilities - they've evolved special tumor supressor genes that work alongside their regeneration pathways, wich is why researchers are studying both mechanisms together!

Then they just need to figure out how to use the non-cancer-gene from those blind naked African rats who can run equally fast forward and backwards, look like a wrinkly penis with legs and teeth and are friends with Ron Stoppable and we will have figured out a cure to cancer while regenerating body parts left and right. It'll be great.

That seems to be what they are trying to control. Just "turning on" the regenerative mechanisms is a fast track to a cancerous growth. This research seems to be aimed at understanding how to provide that mechanism with the chemical instruction of what to grow into. While we aren't there yet, each time a new part of that instruction set is figured out, we get a step closer to regrowing lost tissue. Living organisms are incredibly complex and understanding large, complex processes like growing a limb is going to take a lot of work and time.

Axolotls can't have cancer?

That's a great idea. A banana that regenerates when you cut it in half.

no but if it gets cut off for whatever reason...

It will. It’ll finally grow back now.