# Advancements in porcine xenotransplantation > Live situation record from CLSTR: https://clstr.news/situations/advancements-in-porcine-xenotransplantation > Updated: 2026-09-06T10:43:00.000Z. Sources: 104. Developments: 3. Medical researchers have achieved significant milestones in xenotransplantation, utilizing genetically modified porcine organs to address human organ shortages. In one instance, a Combined Liver-Kidney Transplantation (CLKT) was successfully performed on a 53-year-old brain-dead patient. This procedure involved the simultaneous transplantation of a genetically modified pig liver and kidneys. To prevent immune rejection and coagulation issues, scientists edited six porcine genes to silence human-triggering antigens and express human regulatory proteins. The organs maintained physiological functions, such as bile production and toxin filtration, for a five-day monitoring period. Recent advancements in kidney transplantation have established new benchmarks for longevity. Patient Tim Andrews, a 66-year-old man with end-stage kidney disease caused by type 2 diabetes, received a kidney from a Yucatan miniature pig in January 2025 at Mass General Brigham. The organ underwent 69 genetic edits to mitigate viral risk and immune rejection. According to findings published in The Lancet, the kidney functioned for 271 days, allowing Andrews to avoid dialysis for approximately nine months. While no pig-borne pathogens were detected, the organ eventually failed due to vascular damage and inflammation, leading to its removal in October 2025. Following 82 days of dialysis, Andrews successfully received a kidney from a deceased human donor in January 2026. This case marks the first successful transition from a functioning pig-to-human kidney transplant to a subsequent human organ transplant. Building on this, biotech company eGenesis reported that another patient has lived with a transplanted pig kidney for over nine months (approximately 285 days) without requiring dialysis. This second case sets a new record for the duration of pig kidney function in a human recipient. Researchers suggest these modified organs may serve as a “bridge” for the approximately 100,000 people in the United States currently awaiting human kidney transplants. ## Claims - Tim Andrews received the pig kidney transplant on January 25, 2025. (disputed by 39 sources) - Tim Andrews received a human kidney transplant in January 2026. (disputed by 22 sources) - A genetically modified pig kidney functioned in a human recipient for 271 days. (corroborated by 45 sources) - The medical team at Mass General Brigham published findings on the case in the journal The Lancet. (corroborated by 39 sources) - The pig kidney was removed in October 2025 after it ceased to function. (corroborated by 37 sources) - The transplant provided hope and allowed the patient to avoid dialysis for several months. (corroborated by 27 sources) - Tim Andrews underwent 82 days of dialysis after the pig kidney was removed. (corroborated by 21 sources) - The pig kidney underwent 69 genomic modifications, including the removal of pig genes and the addition of seven human genes. (corroborated by 14 sources) - The pig kidney failed due to damage in the blood vessels and inflammation after approximately six months. (corroborated by 14 sources) - Approximately 100,000 people in the US are waiting for a kidney transplant. (corroborated by 13 sources) - The patient received a human kidney transplant after the pig kidney failed. (corroborated by 11 sources) - No pig-borne pathogens or viruses were detected in the patient during the transplant period. (corroborated by 8 sources) ## Timeline ### 2026-09-06: Massachusetts General Hospital patient survives 271 days with pig kidney A 66-year-old man lived for 271 days without dialysis using a genetically modified pig kidney, a record-breaking xenotransplant success that could serve as a bridge to human organ transplants. 10 sources. https://clstr.news/cluster/genetically-modified-pig-kidney-allows-patient-to-live-nine-months-without-dialysis ### 2026-09-03: Mass General Brigham patient sets record with 271-day pig kidney transplant A patient lived for a record 271 days with a genetically modified pig kidney, successfully using it as a bridge to a human transplant and avoiding dialysis for nearly nine months. 92 sources. https://clstr.news/cluster/pig-kidney-transplant-sets-new-record-of-285-days ### 2026-08-21: Multi-organ xenotransplant from pig to human successfully tested Scientists successfully performed the first multi-organ xenotransplant, using genetically modified pig liver and kidneys in a human, maintaining physiological function for five days. 2 sources. https://clstr.news/cluster/multi-organ-xenotransplant-from-pig-to-human-successfully-tested --- Cite as: Advancements in porcine xenotransplantation. CLSTR, https://clstr.news/situations/advancements-in-porcine-xenotransplantation