TGFB1 and autoimmune hepatitis: Interestingly, TGF-β1 codon 25 Pro/Pro genotype showed a statistically significant association with AIH risk under homozygote model (pooled OR = 14.73, 95% CI: 3.92-55.37) and recessive model (pooled OR = 14.69, 95% CI: 3.98-54.23) (Table 8).