CDH23 and nodular sclerosis classical Hodgkin lymphoma: Common variants, G>A/A, (rs1227051, c.4723G>A) in CDH23 were identified in both brothers in homozygous form which had also been reported in Korean HL patients as a non-synonymous mutation.21 The same variation is presumed as polymorphism in Japanese population with NSHL.22 Therefore, the present study is an agreement with previous studies.