A Human Body Ran on a Pig's Liver and Kidneys

For nearly five days, the body of a 53-year-old brain-dead man ran on the liver and kidneys of a genetically modified pig. No catastrophic rejection. Functioning bile production. Creatinine levels that actually improved. The organs, sourced from a single six-gene-edited pig, did what they were supposed to do.

Chinese researchers performed what is described as the first orthotopic combined whole-liver and bilateral-kidney xenotransplantation, which means the pig organs replaced the human ones entirely, in their normal anatomical positions, rather than being added alongside them. That distinction matters. Previous pig-to-human transplants were mostly auxiliary procedures, where the animal organ worked next to the recipient's own. This one took over.

The donor pig had six genetic modifications: three knockouts designed to eliminate the surface proteins that trigger the human immune system's most violent response, and three human gene insertions meant to help the body tolerate what remained. The recipient had end-stage kidney disease and a prior 67-day history of brain hemorrhage. His family consented to a maximum five-day observation window based on cultural and traditional wishes, which became the study's endpoint.

Over those 106 hours, the pig liver produced bile, maintained albumin levels and kept liver enzymes in a range that looked, at minimum, like a working organ doing its job. The kidneys brought creatinine levels down from critical into normal range. No hyperacute rejection (the immune system's fastest and most lethal response to foreign tissue) was observed at all. Researchers also noted something unexpected: the recipient's systemic metabolism shifted toward a human metabolic profile rather than a porcine one, as though the body was quietly recalibrating around the new parts.

One study, one recipient, five days. The pig organs functioned. The consent clock stopped. That difference matters.

Read the full story at Scientific American, May 29, 2026

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