IL12A and chronic hepatitis B virus infection: An increase of serum IL-12 level was associated with more effective HBV DNA clearance in patients with chronic hepatitis B [58], but no association with HBV persistence and IL-12A exon 7 +6400 C>T, +6624 G>A, 3′UTR +7003 T>C SNPs and haplotype of IL-12A +6400/+6624/+7003 was shown in the study by Park et al. [24].