Experiment in China shows promise but underscores how far xenotransplantation still has to go. In a sterile operating theater at the First Affiliated Hospital of Guangzhou Medical University, surgeons performed a procedure never before attempted. They stitched a lung from a genetically engineered pig into the chest of a 39-year-old man who had been declared brain-dead.
For nine days, the patient’s family watched as machines kept him alive, and as his new pig lung inflated, exchanged gases, and struggled against the inevitable rejection from the human immune system. The experiment, conducted with the family’s consent, was never meant to save his life. It was designed to test a question that has haunted transplant medicine for decades: can animals bridge the desperate gap in the supply of human organs?
The need is stark. More than 100,000 Americans remain on organ waitlists, and across the world, thousands die every year before a suitable donor is found. Lungs are among the rarest organs available. Unlike kidneys, which can be partially replaced by dialysis, patients with lung failure have no fallback option.
In 2024, just over 8,200 lung transplants were performed globally, far fewer than the tens of thousands of patients who needed them. Families watch loved ones tethered to oxygen machines, doctors struggle against time, and patients live in constant fear that the next breath may be their last.
This human crisis has fueled a revival of xenotransplantation. The use of animal organs in humans, as scientists and biotech firms search for sustainable solutions.
The pig lung used in Guangzhou was not an ordinary organ. It came from a Bama miniature pig bred by Clonorgan Biotechnology in Chengdu, genetically engineered with six CRISPR edits. Three pig genes that produce immune-triggering sugars were deleted, while three human genes were added to help regulate inflammation and blood flow.
The surgical team left the patient’s right lung intact as a safety reserve and began a strict regimen of immunosuppressive drugs. At first, there were no signs of hyperacute rejection, which was often the immediate catastrophic immune response that doomed so many past attempts. But by the first full day, the patient’s immune system began fighting back. White blood cells infiltrated the pig lung, fluid filled the tissue and antibody-mediated rejection set in. But, by day nine, the experiment was ended at the request of the family.
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