Patient Survives 8 Months after Gene - Edited Pig Kidney Transplant: A Milestone in Xenotransplantation
Release time:
2025-09-26
Recently, Nature News reported a bombshell in the global medical community. Tim Andrews, a 67 - year - old American, has survived eight months after a gene - edited pig kidney transplant. This is not only the longest - lasting case of a pig organ in a living human but also a milestone in xenotransplantation, offering new hope for the global organ shortage.
69 Gene Edits: Overcoming Transplant Hurdles
The surgery was led by Tatsuo Kawai, director of transplant surgery at the Legreta Clinical Transplant Tolerance Center at Massachusetts General Hospital. Before the operation, Andrews, diagnosed with end - stage renal disease, had been on dialysis for over two years, suffered from severe heart disease, and, as an O - blood - type patient, faced a 5 - 10 - year wait for a human organ. On January 25 this year, Tatsuo Kawai's team successfully implanted a gene - edited pig kidney. Post - surgery, Andrews stopped dialysis and is on a unique immunosuppressive regimen.
The pig kidney features 69 genome edits. 59 inactivate porcine endogenous retroviruses (PERV) for safety; among the other 10, 3 eliminate glycan antigens to prevent hyper - acute rejection, and 7 add human genes for immune regulation, inflammation reduction, coagulation improvement, and complement activation control. Tatsuo Kawai said these 7 human genes aim to replace key compatibility - related proteins, but “which specific ones are essential for successful xenotransplantation remains controversial.”
A Significant Leap: Routine Surgery in Five Years?
The significance is evident when compared with past cases. In March 2024, Richard Slerman died within two months after the world's first pig kidney transplant. Tovana Rooney's transplanted pig kidney lasted only 4 months and 9 days due to rejection. In contrast, Andrews has survived eight months, and Bill Stewart, a 54 - year - old participant, has lived for three months since his June 14 transplant.
Wayne Hawthorne, a transplant surgeon at the University of Sydney, said, “Surviving over 6 months after surgery is remarkable; reaching 12 months would be another milestone.”
Tatsuo Kawai is optimistic about the future of xenotransplantation. “Despite challenges like determining the best gene - editing protocol, I believe pig kidney transplants will be routine in five years,” he said. The team is also exploring new avenues, such as thymus - kidney combined transplants in non - human primates for immune tolerance, and the heart could be the next breakthrough, though liver and lung transplants need more pre - clinical research.
This gene - edited pig kidney transplant brings xenotransplantation closer to clinical reality, offering hope to patients awaiting organs.
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