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Extrahepatic biliary atresia: current concepts and future directions
Elisa de Carvalho1, Cláudia Alexandra Pontes Ivantes, Jorge A Bezerra
1Universidade de Brasília, Brasília, DF, Brazil. elisacarvalho@terra.com.br
Insights
Extrahepatic biliary atresia remains a primary reason for pediatric liver transplants. Understanding its causes, including viral infections and immune responses, is crucial for developing new treatments beyond current surgical options.
Area of Science:
- Pediatric Gastroenterology and Hepatology
- Immunology
- Developmental Biology
Background:
- Extrahepatic biliary atresia (EHBA) is a leading cause of pediatric liver transplantation.
- The exact causes of EHBA are not fully understood, impacting treatment strategies.
Purpose of the Study:
- To review the current understanding of EHBA's etiopathogenesis, diagnosis, treatment, and prognosis.
- To highlight areas for future research and potential therapeutic targets.
Main Methods:
- Comprehensive literature search of MEDLINE and PubMed databases.
- Keywords included: biliary atresia, etiopathogenesis, diagnosis, treatment, prognosis, children.
Main Results:
- Viral infections (CMV, reovirus, rotavirus), immune responses (TH1, interferon-gamma), genetic factors, and embryonic development issues are implicated in EHBA.
- Portoenterostomy is the only treatment, with optimal outcomes before 2 months of age.
- Untreated EHBA leads to fatal complications; most treated patients require liver transplantation.
Conclusions:
- EHBA continues to be the main indication for pediatric liver transplantation.
- Further research into EHBA's diverse etiopathogenesis, particularly the role of cytokines like interferon-gamma, is needed for novel therapeutic interventions.
Objective:
To provide an updated review on extrahepatic biliary atresia, focusing mainly on its etiopathogenesis, diagnosis, treatment and prognosis.
Sources:
MEDLINE and PubMed databases were searched using the following keywords: biliary atresia, etiopathogenesis, diagnosis, treatment, prognosis, children.
Summary Of The Findings:
Extrahepatic biliary atresia is the main indication for liver transplantation among pediatric patients. As to its etiology, cytomegalovirus, reovirus and rotavirus have been widely investigated as possible triggers of the immunomediated obstruction of the biliary tree. The immune response, especially the predominant TH1 and interferon-gamma responses, genetic susceptibility and disorders related to the embryonic development of the biliary tree can play a role in the etiopathogenesis of extrahepatic biliary atresia. Yet today, portoenterostomy is the only available treatment, with better results when performed in the first 2 months of life. As to prognosis, all untreated children eventually die due to complications resulting from portal hypertension and liver cirrhosis, and most treated children have to undergo liver transplantation.
Conclusions:
Extrahepatic biliary atresia is still the major indication for pediatric liver transplantation, and to change this scenario some more light should be shed upon the etiopathogenesis of biliary atresia in different disease phenotypes. Future research into the role of interferon-gamma and of other cytokines is necessary in order to assess whether these aspects should be potential targets for therapeutic intervention.