Non-amyloid liver involvement in familial Mediterranean fever: a systematic literature review.

INTRODUCTION: Familial Mediterranean fever (FMF), the most frequent autoinflammatory disease, is caused by mutations in the MEFV gene. It is characterized by recurrent febrile attacks of polyserositis. Liver abnormalities may develop during its course, but they remain poorly defined. OBJECTIVE: To describe liver involvement in FMF patients. METHODS: A systematic search was conducted through Pubmed/Medline and Embase from 1946 to January 2020. All articles describing children and adults with FMF and liver involvement were included. Patients with amyloidosis were excluded. The selected full-text articles were independently reviewed by 3 investigators. RESULTS: Forty-three articles were identified, of which 20 articles with a total of 99 patients were included: 74 adults, 23 children and 2 patients of unknown age. Ten patients had cryptogenic cirrhosis, 48 had nonalcoholic fatty liver disease (NAFLD), 4 had Budd-Chiari syndrome (BCS), 12 had isolated hyperbilirubinemia, and 25 had elevated liver enzymes. CONCLUSION: Despite a low prevalence of metabolic risk factors, FMF may be associated with NAFLD and cryptogenic cirrhosis as a consequence of chronic or recurrent inflammation. FMF patients should be regularly screened for liver injury. The latter may be prevented and treated by daily colchicine intake. The evidence was insufficient to establish an association with BCS, hyperbilirubinemia, or autoimmune hepatitis.