Autoimmune Hepatitis: Clinical Characteristics and Predictors of Biochemical Response to Treatment.

Background and Objectives: Autoimmune hepatitis (AIH) is an important cause of chronic liver disease. Aim of this study was to evaluate the clinical characteristics and factors predicting response to treatment in patients with AIH.

Methods: In this prospective observational study, all patients diagnosed with AIH from 2017 to 2019 were included. Biochemical response to the treatment was checked three months after the start of the treatment. Response was considered good if transaminases normalized, or poor if either remained persistently elevated or improved partially.

Results: Of the total 56 patients, 41 (73.2%) were females. Mean age was 29.5 (±16.9) years. About half (53.6%; n = 30) the patients were aged < 25 years and majority [47 (83.9%)] were cirrhotic. Autoimmune serology was negative in 20 (35.7%). Seronegativity was associated with severe necroinflammation ( P = 0.015) and esophageal varices ( P = 0.021). Response to treatment was good in 34 (60.7%). Bivariate analysis showed that good response to treatment was associated with pre-treatment serum IgG level > 20 g/L ( P = 0.024), presence of pseudorosettes on histopathology ( P = 0.029) and three months post-immunosuppression serum total bilirubin < 2mg/dL ( P < 0.001). Multivariate logistic regression analysis showed that only pre-treatment serum IgG >20 g/L ( P = 0.038) and post-treatment serum total bilirubin <2 mg/dL ( P = 0.004) were independent predictors of good response to treatment.

Conclusion: Majority of AIH patients in our study were young and cirrhotic. A negative autoimmune serology does not rule out AIH and liver biopsy may be required to confirm the diagnosis. Seronegative AIH rapidly progresses to advanced liver disease. Response to treatment is good with pre-treatment IgG > 20g/L and post-treatment total bilirubin < 2 mg/dL.