A New Hampshire man fought for the chance at a pig kidney transplant, spending months getting into good enough shape to be part of a small pilot study of a highly experimental treatment. His effort paid off: Tim Andrews,

With the procedure, Tim Andrews, 66, of Concord, New Hampshire, became the fourth person in the world to receive a genetically-edited pig kidney He was discharged from the hospital on Feb. 1, with his new kidney functioning as expected.

For the second time, Massachusetts General Hospital has transplanted a genetically edited pig kidney into a human.