RESUMO
Programmed cell death protein-1 (PDCD1) is considered a key factor in immune regulation and is expressed mainly on activated T cells. The current study aimed to assess the clinical value of soluble PDCD1/PD1 as a marker for diagnosing type-1 autoimmune hepatitis in children. Sixty children with chronic hepatitis as patients' groups further divided into autoimmune hepatitis group and other chronic liver disease group and 20 healthy children as a control group were enrolled in this study. All children have been studied for clinical profile, biochemical, histological features and serum level of soluble programmed cell death protein-1 by ELISA. There was a significant increase regarding soluble PDCD1/PD1 in the autoimmune hepatitis group than the chronic liver disease group, with the lowest level in the control group. Soluble PDCD1/PD1 level increased with higher fibrosis stage and higher Child Pugh score, also higher in relapsed patients than patients with complete remission in AIH groups. There was a positive correlation between soluble PDCD1/PD1 and PT, IgG, fibrosis stage, HAI, ALT, AST, simplified and revised score system, PELD and MELD among the AIH group. The best cutoff value of PDCD1/PD1 in the prediction of autoimmune hepatitis was 1.73 ng/ml with AUC:0.895 that has a sensitivity of 80%, specificity of 78%. sPDCD1/PD1 level represents a possible promising biomarker of AIH patients who will represent an incomplete response for regular treatment. This finding can be considered as the first step to prove the pivotal role of soluble PDCD1/PD1 in the diagnosis of AIH.