KIR3DL1 and classic Hodgkin lymphoma: KIR haplotype B subgroup carriers accounted for 72% of the total cHL cohort and carrier frequencies of B-specific genes i.e. KIR2DS2, KIR2DL2, KIR2DL5, KIR2DS3, KIR2DS5, KIR3DS1 and KIR2DS1, ranged from 26% to 54% (Supplementary Table 1).