Among 655 French patients with CyKD and a molecular diagnosis reported for clinical purposes, 80% had PKD1 variants (28) and consistent with similar data from patients undergoing genetic testing for CyKD in a clinical setting in the UK (unpublished National Registry of Rare Kidney Diseases [RaDaR] data: 438/550 (80%) patients have PKD1 variants). Here, PKD1 is linked to kidney disorder.