GJB2 and Hodgkins lymphoma: It is estimated that the c.35delG mutation is carried by 1–3% of the European population.20, 21 The most common GJB2 genotype occurring in European patients with HL is the homozygous genotype c.[35delG];[(35delG)].20, 21 In our study group of patients with HL, this genotype was also the most common.