In a groundbreaking medical achievement, surgeons in China have successfully transplanted both kidneys and a whole liver from a genetically modified pig into a human for the first time. This historic procedure, performed by a team at the Second Affiliated Hospital of Guangxi Medical University in Nanning, offers renewed hope to countless patients waiting for organ transplants.
The Experimental Procedure
According to a report published in the journal Nature, the experimental surgery was carried out on a 53-year-old man who was brain-dead and whose family consented to the research. The recipient received two kidneys and a liver from a genetically engineered pig. The transplanted organs functioned for nearly five days, allowing doctors to observe how animal organs perform in a human body in real time.
This field, known as xenotransplantation, involves transferring organs, tissues, or cells from one species to another. For years, researchers have explored whether pig organs could alleviate the chronic shortage of human donors. Advances in genetic engineering, particularly CRISPR technology, have made it possible to modify pig DNA to reduce the risk of rejection.
Genetic Modifications in the Pig
The pig used in the procedure had six genetic tweaks. Scientists inserted three human genes to make the organs more compatible with human blood and immune systems, and removed three pig genes known to cause organ rejection. Such modifications are crucial because the human immune system typically attacks foreign tissues.
Results and Limitations
The results were promising. The pig liver began producing bile within 19 hours, indicating functionality. After the pig kidneys were transplanted, the man's waste-filter levels returned to normal, showing the kidneys were working. However, early signs of rejection appeared after about 36 hours. The man's immune system started replacing pig cells with human immune cells, and doctors observed tissue damage and blood clotting in the pig liver. The organs continued functioning for a few more days, but the experiment highlighted the need for more effective anti-rejection strategies.
Significance and Future Prospects
Experts hail this as a major leap forward. Leonardo Riella from Massachusetts General Hospital noted that transplanting multiple organs simultaneously is a huge challenge due to longer surgeries, patient condition, and complications. Successfully transplanting multiple pig organs that work together makes this experiment stand out.
The shortage of donor organs is a grim reality worldwide. In the United States alone, over 100,000 people are on transplant waiting lists, and about a dozen die each day before a kidney becomes available. Pigs are appealing for transplant research because their organs are similar in size and function to human organs, they breed quickly, and genetic tools like CRISPR allow for rapid modification to prevent rejection.
This experiment builds on previous breakthroughs, including transplanting pig hearts, kidneys, partial livers, and lungs into humans. In 2025, doctors kept a genetically modified pig liver working in a brain-dead person for ten days. Recently, pig kidneys have functioned for weeks in humans, suggesting longer-term transplants may be achievable.
Challenges Ahead
Before pig-to-human transplants become routine, several challenges must be addressed: preventing long-term immune rejection, avoiding blood clots, preventing infections, and ensuring animal viruses are not transmitted to humans. Ethical debates also surround the creation and use of genetically engineered pigs for this purpose.
Despite these hurdles, many scientists believe we are on the verge of making xenotransplantation a reliable medical option. While pig organs cannot yet replace human donors, each experiment brings us closer to a future where thousands no longer have to wait years for a life-saving transplant.
This article is based on reporting from the TOI Lifestyle Desk.
