World's first pig-to-human lung transplant shows promise but faces rejection challenges.

Chinese surgeons have performed the world's first pig-to-human lung transplant, implanted into a brain-dead 39-year-old man. The genetically modified pig lung functioned for nine days before showing signs of rejection and fluid buildup. While this marks a significant step in xenotransplantation research, addressing immune response and infection remains a challenge. Experts say more studies are needed to ensure safety and efficacy before clinical trials can proceed.