In a world first that's equal parts medical miracle and barnyard triumph, a genetically modified kidney from a pig named Wilma kept 66-year-old Tim Andrews alive for a record nine months, acting as a temporary 'bridge' to a human transplant. Andrews, who suffered from end-stage kidney disease caused by type 2 diabetes, had a grim 9% chance of getting a human kidney within five years and faced a 40%+ risk of dying or being bumped off the waiting list.

Surgeons at Mass General Brigham in Massachusetts took a kidney from Wilma, a Yucatan miniature pig, and gave it 69 genomic edits - some to dodge pig viruses, others to make the organ more human-friendly and less likely to be rejected. Andrews lived dialysis-free for 271 days before the pig kidney began to fail, and he then received a kidney from a deceased human donor. This marks the longest dialysis-free survival after a pig kidney xenotransplant and the first successful transition to a human transplant.

Andrews, from New Hampshire, called the experience a 'miracle,' noting he could cook, vacuum, and walk his dog Cupcake - activities that had been out of reach while on dialysis. The case, published in the Lancet, offers hope to millions with kidney failure, though the team cautions it's a single patient with no control group and required intensive care that might not be universally available.

Dr. Leonardo Riella of Mass General Brigham said, 'The organ shortage is the greatest crisis we have right now in transplantation.' He envisions xenotransplantation as a bridge to human transplants and, potentially, a destination therapy. Previous attempts have been less successful: the first pig kidney transplant into a living person in 2024 ended after 52 days due to the patient's unrelated heart issues, and no prior study had documented xenograft survival beyond two months.

After about six months, the pig kidney developed vascular damage, leading to its removal at nine months. Andrews spent several months back on dialysis before receiving his human kidney, which functioned well over six months of follow-up. No pig viruses or pathogens were detected, and no new antibodies against human tissue surfaced, suggesting the pig kidney didn't complicate the human transplant.

Riella praised patients like Andrews as 'true pioneers,' saying, 'Without their trust and courage, we would not be able to do what we do.' Further trials are needed, but this success opens the barn door wide for pig kidneys as a bridge for others facing long waits - proving that sometimes, the best organ donor might just have four legs and a curly tail.