Groundbreaking Pig-to-Human Lung Transplant Marks Milestone in Xenotransplantation

In a significant advancement in medical science, researchers at Guangzhou Medical University in China successfully performed the world's first pig-to-human lung transplant. The procedure involved transplanting a genetically modified lung from a Bama Xiang pig into a 39-year-old brain-dead male patient who had suffered a cerebral hemorrhage. The operation, conducted in May 2024, was reported in the journal *Nature Medicine* on August 25, 2025. The transplanted lung functioned for nine days, maintaining viability and gas exchange capabilities during the monitoring period.

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The lung was genetically engineered with six modifications aimed at reducing the risk of immune rejection. These modifications included silencing three pig genes that provoke immune responses and introducing three human genes to enhance compatibility. The patient received immunosuppressive medications to further mitigate rejection risks. Initial results were promising, with no signs of hyperacute rejection or infection observed in the first 24 hours. However, complications arose shortly thereafter, including fluid accumulation and swelling, indicating potential circulation issues.

China performs first pig-to-human lung transplant in brain-dead patient

Despite the initial success, the lung exhibited signs of antibody-mediated rejection by the third and sixth days post-transplant. The experiment concluded on the ninth day at the family's request, as the organ's functionality began to decline. Researchers noted that while the pig lung did not immediately fail, the complexities of lung transplantation—particularly the organ's exposure to external pathogens—pose significant challenges for future applications.

Groundbreaking Pig Lung Transplant into Human Patient Highlights Advances and Challenges in Xenotransplantation

Dr. Stephanie Chang, a lung transplant surgeon at NYU Grossman School of Medicine, remarked on the importance of this study, stating, “It’s very promising and a great first step, but there is a lot more work to do to make this feasible.”

Scientists successfully transplant pig lung into human in astonishing world-first

This pioneering procedure highlights the potential of xenotransplantation as a solution to the global organ shortage crisis, where only about 10% of transplant needs are currently met, according to the World Health Organization. The success of the pig lung transplant could pave the way for further research into using genetically modified animal organs to address the critical demand for human transplants.

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International experts have hailed this achievement as a milestone in xenotransplantation. Beatriz Domínguez-Gil, director of the Spanish National Transplant Organization, emphasized the unique challenges posed by lung transplants compared to other organs, citing their delicate physiological balance and constant exposure to the external environment.

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Dr. Richard Pierson, a professor of surgery at Harvard Medical School, noted the experiment's limitations, stating, “They’ve shown a pig lung can be sewn into a human being and shown what happens, but an opportunity was missed in this experiment.” He highlighted that the study did not isolate the pig lung's function by clamping off the patient's native lung, which would have provided clearer insights into the pig lung's viability.

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While the pig lung transplant represents a significant step forward, researchers acknowledge that substantial challenges remain regarding organ rejection and infection. The Guangzhou team plans to refine gene-editing techniques and immunosuppressive strategies to enhance the longevity and functionality of transplanted organs. As the field of xenotransplantation evolves, ongoing research will be crucial in determining the feasibility of such procedures for clinical application in the future.

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