We still have the homologues of the old regeneration genes that are still active in lizards and such. However, they're not usable because of our strong tumor suppression genes.
We're at least a thousand times bigger than a small lizard and expect to live much longer. Sadly, evolution favored cancer suppression in our genes to ensure our longevity and regeneration didn't provide enough to keep it around. It would be an absolutely monumental task to reverse tens of billions of generations worth of genetic change, and we would basically have to cure cancer first for it to be useful.
We're at least a thousand times bigger than a small lizard and expect to live much longer. Sadly, evolution favored cancer suppression in our genes to ensure our longevity and regeneration didn't provide enough to keep it around. It would be an absolutely monumental task to reverse tens of billions of generations worth of genetic change, and we would basically have to cure cancer first for it to be useful.