However, pathogenic variant analysis of the SLC26A4 gene was previously performed in 246 families with HL cases from the Bashkortostan Republic of Russia (Volga–Ural Region) [50] and in 20 patients with Pendred syndrome, EVA, and/or Mondini anomalies in a geographically dispersed sample [51]. This evidence concerns the gene SLC26A4 and Pendred syndrome.