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Abstract:
This article reports on a landmark achievement in xenotransplantation, where a 67-year-old US man, Tim Andrews, has survived for over six months with a genetically modified pig kidney. This marks the longest a pig organ has survived in a living person. Andrews, who had end-stage kidney disease, has been dialysis-free since the January surgery. The success is significant as the first six months post-transplant are considered the period of highest risk for organ rejection. The kidney, supplied by biotechnology company eGenesis, featured three types of genetic modifications: the elimination of pig antigens to prevent rejection, the addition of human genes to reduce inflammation, and the deactivation of pig retroviruses. This case surpasses previous attempts and is considered a major step forward in the field of animal-to-human organ transplantation.
Landmark Xenotransplantation: Six-Month Survival with a Pig Kidney
Historic Milestone: A 67-year-old US man, Tim Andrews, is still alive more than six months after receiving a genetically modified pig kidney. This is the longest a pig organ has ever survived in a living human recipient.
Medical Significance: Reaching the six-month mark is an "amazing feat" because it represents the highest-risk period for organ rejection and other complications. The patient, who previously required dialysis for end-stage kidney disease, has been dialysis-free since the transplant.
Advanced Genetic Modifications: The pig kidney was extensively modified by the company eGenesis to ensure human compatibility. The key modifications included:
Eliminating three pig antigens to prevent organ rejection.
Adding seven human genes to reduce inflammation and bleeding risks.
Deactivating retroviruses found naturally in the pig genome.
A New Record: This successful case surpasses the previous record, where a different recipient's pig kidney functioned for four months and nine days before being removed due to immune system rejection.
Key Takeaway: The survival of Tim Andrews marks a significant breakthrough for xenotransplantation, demonstrating the potential for genetically modified animal organs to serve as a viable solution for patients with organ failure. Experts note that reaching the 12-month mark would be the next major milestone.