Non-invasive biomarkers for identification of vanishing bile duct syndrome among children with acute cholestatic hepatitis.

Background: The identification of vanishing bile duct syndrome (VBDS) is still challenging before liver biopsy. This study tried to explore non-invasive biomarkers for identification of VBDS among children with acute cholestatic hepatitis.

Methods: Between January 2017 and December 2021, 192 children underwent native-liver biopsy for acute cholestatic hepatitis with onset after 6 months of age. VBDS was diagnosed by liver biopsy. Differences of liver biochemical indices were compared between children with and without VBDS. Diagnostic performances for VBDS were tested by receiver operating characteristic (ROC) curve analyses.

Results: Among the 192 patients, 24 (12.5%) were diagnosed with VBDS based on liver biopsy. At biopsy, their levels of total bilirubin (TB), direct bilirubin (DB), γ-glutamyl transpeptidase (GGT), total bile acid, triglyceride, and total cholesterol (TCH) were higher than patients without VBDS (all P<0.05). However, only GGT and TCH could distinguish patients with VBDS from patients without VBDS with an area under ROC curve (AUC) >0.850. Using GGT >446 U/L as a cut-off value, the sensitivity was 87.5%, the specificity was 91.6%, and the AUC was 0.948 (P<0.001). Using TCH >6.4 mmol/L as a cut-off value, the sensitivity was 100.0%, the specificity was 89.8%, and the AUC was 0.983 (P<0.001). A total of 28 patients had both GGT >446 U/L and TCH >6.4 mmol/L, including 21 patients with VBDS and 7 without VBDS (21/28 . 3/143, P<0.0001). Three patients with VBDS would be missed for GGT <446 U/L.

Conclusions: Both GGT and TCH can be used as non-invasive biomarkers for identification of VBDS among children with acute cholestatic hepatitis.