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Genetically Modified Pig Kidney Keeps Patient Off Dialysis 271 Days

9/4/2026

Summary

Story summary

U.S. surgeons transplanted a genetically modified pig kidney into 66-year-old Tim Andrews in January 2025.
The kidney kept Andrews off dialysis for 271 days, the longest xenotransplant survival.
Blood-vessel damage after about six months caused the pig kidney to fail.
No pig viruses, pathogens, or antibodies against human tissue were detected during or after the xenotransplant.
Andrews received a deceased-donor human kidney in January 2026 after returning to dialysis.

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Story summary

U.S. surgeons transplanted a genetically modified pig kidney into 66-year-old Tim Andrews in January 2025.
The kidney kept Andrews off dialysis for 271 days, the longest xenotransplant survival.
Blood-vessel damage after about six months caused the pig kidney to fail.
No pig viruses, pathogens, or antibodies against human tissue were detected during or after the xenotransplant.
Andrews received a deceased-donor human kidney in January 2026 after returning to dialysis.