COMPARATIVE STUDY
JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
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Metformin use in children with nonalcoholic fatty liver disease: an open-label, 24-month, observational pilot study.

BACKGROUND: There is no consensus on the treatment of pediatric nonalcoholic fatty liver disease (NAFLD). However, in a small pilot study conducted in 10 children, metformin has been proposed to be effective.

OBJECTIVE: We aimed to determine the effect of metformin in addition to lifestyle intervention/modification in children with NAFLD.

METHODS: Overweight or obese children aged 9 to 18 years with biopsy-proven NAFLD or nonalcoholic steatohepatitis were enrolled in an observational pilot study, initially planned for 12 months, which aimed to estimate the effect of metformin on liver enzymes. The study was extended to 24 months to estimate outcomes on liver histology. All subjects received lifestyle intervention (nutritional counseling and a physical exercise regimen) and metformin 1.5 g/d (MET group). To serve as the control in this study, we selected a control group from a separate but parallel study (N=30) that had identical inclusion criteria on the use of antioxidants in NAFLD. End points were changes in liver enzymes and histology. Insulin resistance (IR) was estimated by the Homeostasis Model Assessment of IR (HOMA-IR) and liver biopsy was determined by the NAFLD activity score (NAS).

RESULTS: Sixty patients were assessed for inclusion in this study. However, 2 patients in the MET group dropped out of the study during the first year because they relocated abroad, and 1 patient in the control group refused follow-up after 12 months. Thus, study data is based on the findings in the 57 remaining patients. Alanine aminotransferase significantly improved from baseline with decreasing body weight in both groups (MET: 35 [range, 21-43] to 32 [20-46] U/L; control: 66 [28-121] to 33 [14-45] U/L; P
CONCLUSION: In this small, 24-month observational study, metformin did not appear more effective than lifestyle intervention in ameliorating levels of aminotransferases, steatosis, and liver histology in these children with NAFLD.

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