In January 2024, a surgical team at Massachusetts General Hospital performed an operation that many thought impossible: they transplanted a genetically modified pig kidney into a living human patient. For the first time, a xenotransplanted organ (an organ from an animal) functioned successfully in a person. This breakthrough opens a profound new possibility for the thousands of people waiting for kidney transplants who may never receive a human organ.
What is a pig kidney transplant?
The pig kidney used in the transplant wasn’t a regular pig kidney. It was from a pig that had been genetically edited to remove genes that would trigger immediate rejection, and to add human genes that would help the organ integrate with the patient’s immune system. These modifications were made by eGenesis, a biotechnology company working on xenotransplantation.
The patient, Richard Slayman, was a 62-year-old with end-stage kidney disease who was ineligible for a human kidney transplant due to his medical history. He received the pig kidney through a compassionate use pathway – an emergency exception that allowed the surgery to proceed when traditional options had been exhausted.
What happened next surprised many researchers: the kidney worked. It filtered blood, produced urine, and functioned as a human kidney would. For the first time, xenotransplantation moved from theory into clinical reality.
You can read the full original article from BBC News here: First pig kidney transplant in a person.
Why this matters for kidney patients
The numbers tell the story: at any given moment, approximately 5,000 people in the UK are waiting for a kidney transplant. The average wait is 3-4 years. Many will never receive a human organ – there simply aren’t enough donors. Some will die while waiting. Some will spend years on dialysis, which is gruelling, expensive, and ultimately shortens life expectancy.
Xenotransplantation, if successful, could fundamentally change that equation. If pig kidneys can be reliably produced, genetically matched to individual patients, and transplanted with long-term success, the waiting list problem could be solved. Every patient who currently waits for a human kidney could have access to a xenotransplanted organ instead.
The successful pig kidney transplant is a watershed moment. For the first time, we can see a genuine path toward ending the organ shortage.
– Guy Hill, Chair of MRIKPA
What this does – and does not – mean right now
It’s crucial to be clear about what this breakthrough does and doesn’t mean. One successful transplant, even a remarkable one, is not the same as a proven, widely available treatment. Several critical questions remain unanswered:
How long will the pig kidney continue to function? The transplant needs to work for years, ideally decades, to justify the surgery and the risks involved. Animal studies have been encouraging – genetically modified pig kidneys have functioned for months in non-human primates – but human longevity is the real test.
Will xenotransplantation work for most patients, or only for a narrow subset? The recipient needs to be immunosuppressed (have their immune system dampened to prevent rejection), which carries its own risks, including infection and cancer. Researchers need to understand which patients can safely tolerate these risks.
What are the long-term safety implications? Will there be unknown complications that only emerge after years of living with a pig organ? Researchers are monitoring carefully for viruses or other biological triggers that might cause delayed problems.
Clinical trials are now underway to answer these questions. Multiple centres are participating, and rigorous data collection will tell us whether xenotransplantation can become standard treatment.
If you’re on the kidney transplant waiting list, speak with your transplant team about whether you might be eligible for a xenotransplantation trial in the future. If you’re interested in learning more about organ donation and transplantation, visit our pages on organ donation and living with transplants.
For questions about your transplant options, contact MRIKPA at support@mrikpa.org.uk or call 07745 242 684.
Source: BBC News, January 2024 – read the original article
This article is provided for general information and awareness purposes only and was believed to be accurate at the time of publishing. It is not intended as medical advice – please always consult your doctor or renal team for guidance on your individual circumstances. Images used are for illustration purposes only and may not be medically or editorially accurate. While we take every care, errors can occur. If you spot an inaccuracy, please let us know at support@mrikpa.org.uk.
