Chinese surgeons transplanted a genetically modified pig liver segment into a patient with a liver tumor at risk of rupture; the xenograft operated as an auxiliary graft and supported the recipient’s metabolic functions for 38 days before removal due to thrombotic microangiopathy. The team reported pig‑derived bile, albumin and clotting factors produced by the graft and documented clinical stabilization while the organ functioned. Authors published the case in the Journal of Hepatology and characterized the procedure as proof‑of‑concept that xenogeneic organs can perform physiological functions in humans in the short term. The report highlights immunologic and coagulation complications that require management and frames auxiliary xenografts as potential bridges to recovery or donor organs.