Use stem cells, cancer cells use anything, stick it in a box, put in a filter, keep it external to the body, like one of those new insulin pumps.
Or shrink the dialysis machine down the size of one of those new insulin pumps, and have it on the person 25/7.
Right now I think there's 50/50 chance advancements like that will NOT happen in the US, but in less regulated places like China.