The world’s first patient with a transplanted pig kidney has died, almost two months after the operation. In March, Massachusetts General Hospital transplanted the genetically-edited pig kidney into Rick Slayman, a 62-year-old man living with end-stage kidney disease. The operation was a milestone in xenotransplantation – the transplantation of organs or tissues from one species to another – as a potential solution to the worldwide organ shortage, the hospital said at the time. Slayman’s death was not linked to the transplant, the hospital said on Saturday. “Our family is deeply saddened about…