Autoimmune hepatitis (AIH) patients can present with advanced fibrosis at diagnosis or may progress to the same if biochemical remission on treatment is not achieved.

We conducted a single-center retrospective analysis of 34 pediatrics and 39 adult AIH patients. Three pathologists, blinded to clinical information, reviewed the diagnostic liver biopsy (DLB) slides of AIH patients. We evaluated the impact of clinical, laboratory, and histopathologic parameters on outcomes including biochemical remission (BR).

Incidence of advanced (Ludwig stage 3 or 4) fibrosis on DLB was 45.2%. AIH patients with advanced fibrosis had higher median Ishak score (p<0.001) and higher IgG level (p=0.01) at diagnosis. The incidence of BR at 6-month (31.2% vs. 88.6%, p=0.001) and 1-year (68.8% vs. 88.6%, p=0.04) post-diagnosis was significantly lower in AIH patients with advanced fibrosis. Although not statistically significant, a higher proportion of AIH patients with advanced fibrosis were on high dose of steroids (58% vs. 37.9%, p=0.1) at 1 year post diagnosis. Higher serum IgG level at diagnosis was associated with lower odds of achieving BR at 6-month (p = 0.004) and 1-year (p=0.03) post-diagnosis in multivariate analysis. Pediatric age at diagnosis (p=0.02) was associated with higher steroid dose at 1-year post-diagnosis in univariate analysis.

Findings of advanced fibrosis on DLB of AIH patients was accompanied by more pronounced necro-inflammatory activity and higher serum IgG level, which translated to lower rates of BR and higher exposure to steroids during the first year after diagnosis.