Science2025-2026United Stateshigh confidence

A genetically modified pig kidney kept a patient named Tim Andrews alive without dialysis for 271 days, marking the first reported use of a pig kidney as a bridge to human organ transplantation.

Notes on verification

Confirmed by multiple independent, high-quality sources including Mass General Brigham's press release, Harvard Medical School news, NBC News, and a peer-reviewed publication in The Lancet. All key facts (patient name, duration, outcome, first-of-its-kind status) align across sources. [tier=silver indep_score=0.875 clusters=4 claim_tier=exceptional]

Sources