Due to difficulties in sequencing the VNTR region of MUC1and the risk of renal biopsy in suspected patients with renal insufficiency, Živná M et al. 14 developed an immunostaining method for MUC1fs in urinary exfoliated cells for screening of ADTKD-MUC1. The gene discussed is MUC1; the disease is autosomal dominant medullary cystic kidney disease with or without hyperuricemia.