A Massachusetts man has regained his voice after surgeons removed his cancerous larynx and, in a pioneering move, replaced it with a donated one. Transplants of the so-called voice box are extremely rare, and normally aren't an option for people with active cancer. Marty Kedian is only the third person in the U.S. ever to undergo a total larynx transplant - the others, years ago, because of injuries - and one of a handful reported worldwide. Surgeons at the Mayo Clinic in Arizona offered Kedian the transplant as part of a new clinical trial aimed at opening the potentially lifechanging operation to more patients, including some with cancer, the most common way to lose a larynx.