TAMEing ADPKD with metformin: safe and effective?

The biguanide metformin has been safely and widely used in the treatment of type 2 diabetes mellitus for decades. Preclinical studies have suggested that it may have a role in slowing disease progression in autosomal dominant polycystic kidney disease. In this issue, Perrone et al. report results from the Trial of Administration of Metformin in PKD (TAME PKD) study, a phase 2 randomized controlled trial investigating the safety and tolerability of metformin in patients in the early stages of autosomal dominant polycystic kidney disease. We discuss the implications of these findings and how they relate to a major phase 3 trial in autosomal dominant polycystic kidney disease that will start later in 2021.