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“Tim Andrews lived with a genetically modified pig kidney for nine months before receiving a deceased-donor human kidney, constituting the first known transition from a pig-kidney xenotransplant to a human kidney transplant.”
The conclusion
The evidence supports both the timeline and the historic characterization. Andrews lived with a genetically modified pig kidney for 271 days—about nine months—and subsequently received a deceased-donor human kidney, the first documented transition of this kind. He underwent roughly three months of dialysis between the two organs, so the transition was not immediate.
Caveats
- The pig kidney was removed after failing, followed by roughly three months of dialysis before the human transplant.
- “Transition” describes the sequence of transplant types, not a direct or uninterrupted organ swap.
- The organ developer's promotional materials have commercial conflicts, although independent reporting and clinical documentation corroborate the case.
This analysis is for informational purposes only and does not constitute health or medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making health-related decisions.
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Sources
Ranked by source quality and relevance
A genetically modified kidney from a pig called Wilma has kept a 66-year-old man with kidney failure alive for a record nine months and successfully acted as a “bridge” to a human transplant in a world first.
The donor kidney had been harvested from a genetically modified pig to make it suitable for human donation … The kidney continued to function for 271 days until it was removed in October that year. Tim then needed dialysis for 82 days until he had an organ from a donor in January of this year. That organ has been working well.
A genetically modified pig’s kidney kept a man with organ failure off dialysis for nine months while he waited for a suitable human donor’s kidney to become available. … Andrews went back onto dialysis for about three months, before finally receiving a suitable human kidney in January 2026. This marks the first time a pig kidney has been used as a temporary bridge to a human transplant.
He lived successfully with the genetically edited organ for 271 days before transitioning to a short period of dialysis and subsequently receiving a donor human kidney. … Medical teams said the milestone marks the longest recorded dialysis-free survival following a pig kidney transplant in a living patient, and the first successful transition from pig-to-human kidney transplantation.
After living with a gene-edited pig kidney for nearly a year, Tim Andrews received a human kidney transplant in January 2026. … During the 271 days that he lived with the xenotransplanted porcine kidney, Andrews did not need dialysis. … Andrews’ situation represents the longest dialysis-free survival following porcine kidney xenotransplantation in a living human and the first transition to human kidney transplantation.
In January 2026, Tim Andrews, who had received a genetically edited pig kidney in January 2025, became the recipient of a human kidney. … Authors report that Andrews, 66 at the time of xenotransplantation, successfully lived with the genetically edited kidney for 271 days—during which he did not need dialysis—before receiving a human kidney from a donor. … His case represents the longest dialysis-free survival following porcine kidney xenotransplantation in a living human and the first transition to human kidney transplantation.
A man who received a pig organ transplant lived with it for a record-setting eight months. … Andrews, who had the pig organ removed and returned to dialysis at the end of October, is the longest to have lived with a xenotransplant (an organ transplanted from one species to another).
Still, the man was able to go back on dialysis and the lengthy survival of the kidney in him marks another step forward for the xenotransplantation strategy. … On the night of 23 October, surgeons removed the kidney, which Andrews referred to as “Wilma” because that was the name of his pig donor. … Andrews says he is now “praying for a live kidney donor to save my life.”
One year ago, Tim Andrews was among the world’s first recipients of a genetically modified pig kidney. Now, he is the first in that small group of pioneers to go on to receive a human kidney. … “I’m the first one that went across the bridge. … I’m the only person in the world that’s ever had a pig kidney and then had a human kidney after it,” he told CNN from the hospital on Thursday. … Andrews, who has diabetes and was living with end-stage kidney disease, received a pig kidney on January 25, 2025, and lived with it for a record 271 days.
A man who lived with a genetically modified pig kidney for a record 271 days had the organ removed and will return to dialysis. … Tim Andrews of New Hampshire received the transplant in January, but surgeons at Mass General Brigham removed the organ Thursday because of a decline in kidney function.
A US patient has become the first person known to "cross the bridge" from a genetically modified pig kidney to a human kidney transplant. … Tim Andrews, who lived with diabetes and end-stage kidney disease, received a pig kidney in January 2025 as part of an experimental xenotransplant program, and kept it functioning for a record 271 days before his body rejected the organ.
Surgeons removed a genetically modified pig kidney from 67-year-old Tim Andrews last week. The fourth person in the United States to receive a genetically modified kidney, he lived with it for a record 271 days. … Andrews will now resume dialysis and wait for a human kidney transplant.
A significant advancement in xenotransplantation has been demonstrated by the recent case of a porcine kidney that functioned in a human for a record-breaking 271 days before being removed due to continuous proteinuria (1) . … The patient was able to engage in regular activities during the approximately nine months of graft function, which resulted in meaningful dialysis-free survival.
Tim Andrews, who received an experimental pig kidney transplant, now has a human organ. … Andrews, who has diabetes and was living with end-stage kidney disease, received a pig kidney on Jan. 25, 2025, and lived with it for a record 271 days. … But at nearly midnight on Jan. 12, Mass General Brigham called to tell him that a human kidney — a near-perfect match — had been identified.
One year ago, Tim Andrews was among the world’s first recipients of a genetically modified pig kidney. Now, he is the first in that small group of pioneers to go on to receive a human kidney. … “I’m the first one that went across the bridge. … I’m the only person in the world that’s ever had a pig kidney and then had a human kidney after it,” he told CNN from the hospital on Thursday. … Andrews, who has diabetes and was living with end-stage kidney disease, received a pig kidney on January 25, 2025, and lived with it for a record 271 days. After his body rejected the organ, it was removed in October, and Andrews returned to dialysis
His effort paid off: Tim Andrews, 66, is only the second person known to be living with a pig kidney. Andrews is free from dialysis, Massachusetts General Hospital announced Friday, and recovering so well from the Jan. 25 transplant that he left the hospital a week later.
One of those two cases involved Tim Andrews, who survived about nine months with a gene-edited porcine kidney. … The other big win is that we were able to safely perform a nephrectomy, return Mr. Andrews to dialysis, and then 12 weeks later allow him to get a human graft. And now he's 78 days post human allotransplant and doing well.
Tim Andrews, of New Hampshire, set a world record — living with the genetically modified kidney for 271 days. … Doctors removed the kidney after the organ's function began to decline. Andrews will now resume dialysis and will remain on the list for a human donor kidney.
Tim Andrews, the New Hampshire man who lived 271 days with a transplanted pig kidney, has received a human kidney transplant. … Andrews lived with a genetically modified porcine kidney from January to October 2025, when it was removed due to a decline in kidney function.
The recipient, 66-year-old Tim Andrews of Concord, NH, has been on dialysis for more than two years due to end-stage kidney disease (EKSD). … Andrews was successfully discharged from MGH on Saturday, February 1 and is now recovering, off dialysis for the first time in over two years, with his new kidney functioning as expected. … Andrews is now the fourth person in the world to receive a genetically-edited pig kidney and is one of two people currently living with one.
Surgeons transplant a genetically edited pig kidney into patient Tim Andrews on Jan. 25. … The patient, 66-year-old New Hampshire resident Tim Andrews, is the fourth person in the world to receive a pig kidney and one of two people currently living with one.
In October 2025, the porcine kidney was removed after functioning for nearly nine months, setting a new world record. … On January 13, 2026, Mr. Andrews received a kidney from a human donor, demonstrating the feasibility of allotransplant after xenotransplant, another milestone for the field and for patients suffering from kidney failure.
Surgeons at Massachusetts General Hospital transplanted a genetically-edited pig kidney into 66-year-old Tim Andrews of Concord, N.H. on Jan. 25, 2025. … Andrews is the fourth living person in the world to receive a pig kidney, and just one of two people currently living with one.
A New Hampshire man who became one of the world’s earliest recipients of a genetically modified pig kidney has returned home to Concord after receiving a near-perfect human donor kidney at Massachusetts General Hospital. Tim Andrews, who had been living with diabetes and end-stage kidney disease, underwent the new transplantation on Tuesday after physicians located and procured a compatible human organ. … Andrews first received the experimental pig kidney last year and lived with that organ for 271 days before his body mounted a rejection response and the animal kidney was removed days ago.
Andrews lived with the pig kidney for 271 days before his immune system ultimately rejected that organ. … On January 12 a near‑perfect human kidney match was identified, and he went into transplant surgery the following day. … The case has captured attention because it bridges two stages of transplant innovation: experimental xenotransplantation using a gene‑edited pig organ, followed by a conventional human kidney transplantation.
Tim Andrews, who had been on dialysis for more than two years, underwent the successful transplant of a genetically edited pig kidney on Saturday, Jan. 25, 2025. … Andrews was successfully discharged from Mass General on Saturday, February 1, 2025, and is now recovering, off dialysis for the first time in over two years, with his new kidney functioning as expected.
Andrews is back on thrice weekly dialysis after his transplanted kidney was removed in October. … It was all thanks to a genetically-altered pig kidney that Andrews received in a transplant in January. … While Andrews’ transplant journey was ground-breaking, he’s now back in the same place as before: enduring the relentless cycles of dialysis and hoping for a lifesaving donor, soon.
Tim Andrews has lived with a pig kidney for eight months in a new record for a gene-edited animal organ transplant. … For eight months US man Tim Andrews has been living with a pig kidney in his body.
The retired grocery store manager was told he would have to wait five years before reaching the top of the transplant list and qualifying for a new, life-saving kidney. … So last year, he volunteered for an experimental surgery at the leading edge of scientific research: He agreed to get a pig kidney to replace his own failing organ.
The MGH clinical team also performed the historic first transplant of a genetically engineered porcine kidney, supplied by eGenesis, into a living human in March 2024. The recipient, 66-year-old Tim Andrews, has been on dialysis for more than two years due to end-stage kidney disease (ESKD). … Following successful transplant with an eGenesis porcine kidney (EGEN-2784), Andrews was successfully discharged from MGH on Saturday, February 1 and is now recovering, off dialysis for the first time in over two years, with his new kidney functioning as expected.
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Debate
Two AI advocates debated this claim using the research gathered.
Argument for
The claim is corroborated by an overwhelming consensus across highly authoritative and independently verified sources—Source 1 (The Guardian), Source 2 (BBC), Source 3 (New Scientist), Source 4 (The Independent), Source 5, Source 6, and peer-reviewed medical literature in Source 11 and Source 13—all confirming Tim Andrews lived with eGenesis's gene-edited pig kidney for 271 days (approximately nine months) before receiving a deceased-donor human kidney in January 2026, explicitly labeling this the 'first successful transition from pig-to-human kidney transplantation.' Andrews himself, as reported in Source 9 and Source 15, confirmed his unique status in the world, stating 'I'm the only person in the world that's ever had a pig kidney and then had a human kidney after it,' which combined with medical institution statements from Mass General Brigham (Source 17, Source 22) and scientific journals leaves no credible basis to dispute this claim's accuracy.
The Proponent cherry-picks the term "transition" from various reports while deliberately ignoring that their own cited evidence, specifically Source 2 and Source 3, explicitly confirms the pig kidney was removed in October 2025. By failing to account for the nearly three-month period where Andrews relied on dialysis before receiving a human kidney in January 2026, the Proponent falsely equates two interrupted, sequential procedures with a direct medical transition.
Argument against
Although Andrews is the first person to eventually receive a human kidney after a porcine xenotransplant, the claim is false because it implies a direct transition between the two organs. According to Source 2 and Source 3, the pig kidney actually failed and was removed in October 2025, forcing Andrews to return to dialysis for nearly three months before receiving the human kidney in January 2026.
The Opponent commits a false-precision fallacy by treating 'transition' as requiring an uninterrupted, dialysis-free swap, yet no source—including the Opponent's own citations, Source 2 and Source 3—defines the claim that narrowly; Source 3 explicitly calls this 'the first time a pig kidney has been used as a temporary bridge to a human transplant,' and Source 11 titles the phenomenon 'Xenograft-to-Allograft Transition' despite the intervening dialysis period. The intervening 82-92 days of dialysis documented in Source 2 and Source 17 does not negate the sequential, first-of-its-kind clinical pathway that eGenesis (Source 22), Mass General Brigham, and peer-reviewed literature (Source 13) all unanimously characterize as the first successful pig-to-human transplant transition.
Panel Review
3 specialized AI experts evaluated the evidence and arguments.
Reviewer 1 — The Logic Examiner
The core factual chain is solidly supported by convergent, high-quality sources (1-6, 9, 11, 13, 17, 22): Andrews lived with the pig kidney for 271 days (~nine months), it was removed after failing, he underwent ~82-92 days of dialysis, and then received a deceased-donor human kidney in January 2026, with multiple outlets and the CNN quote from Andrews himself explicitly labeling this the first known sequential pig-to-human kidney transplant transition. The Opponent's rebuttal raises a valid precision point (the 'transition' was not seamless but included an interrupted dialysis gap), which slightly tempers the word 'transition' but does not logically refute the substance of the claim since the sources themselves use that exact framing despite the gap, so the inferential chain from evidence to claim holds with only a minor scope quibble rather than a fatal flaw.
Reviewer 2 — The Source Auditor
The most reliable outlets—Source 1 (Guardian), Source 2 (BBC), Source 3 (New Scientist), Source 4 (Independent), Source 9 (CNN), and peer-oriented pieces such as Source 11—independently report that Tim Andrews retained a gene-edited pig kidney for 271 days (~nine months), underwent a brief dialysis interval after its removal, then received a deceased-donor human kidney in January 2026, and uniformly describe the sequence as the first known pig-to-human kidney bridge or transition. Trustworthy evidence therefore fully confirms both the duration and the historic first-transition elements of the claim.
Reviewer 3 — The Precision Analyst
Sources 1–6 and 9–11 consistently report that Andrews lived with a genetically modified pig kidney for 271 days (approximately nine months), later received a deceased-donor human kidney in January 2026, and was the first known pig-kidney-to-human-kidney case; Sources 2–4 clarify that dialysis intervened after the pig kidney was removed. The claim is true as worded because “transition” does not explicitly assert an uninterrupted direct organ-to-organ swap, although it omits that intervening dialysis period.
Panel summary
Source analysis shows consistent reporting from major independent outlets, specialist publications, and clinical documentation that Tim Andrews lived with a gene-edited pig kidney for 271 days and later received a deceased-donor human kidney. The chronology and approximately nine-month duration are precise. The only material interpretive concern is that the transition was not immediate: the pig kidney was removed after failing, and Andrews underwent roughly three months of dialysis before the human transplant. However, “transition” does not inherently require a seamless exchange, and the evidence consistently identifies this as the first known or clinically documented xenograft-to-allograft kidney sequence. Commercial sources have conflicts, but the conclusion does not depend on them.