IL6 and hematocrit: Specifically, heterozygous genotype Arg/Pro of rs 1042522 located on the TP 53 gene, polymorphisms of the IL-23R gene rs17375018, polymorphisms of the IL-6 gene promoter (-572) C/G, and IL-6 rs1800795 have been associated with HT susceptibility [100,101,102,103].