Effect of Vitamin E on Pediatric Nonalcoholic Fatty Liver Disease (NAFLD)

Overview

No proven treatment exists for nonalcoholic fatty liver disease (NAFLD) in children and adolescents. We aim to determine the efficacy of lifestyle intervention with or without antioxidant therapy in pediatric NAFLD.

Full Title of Study: “Lifestyle Intervention and Antioxidants in Children With Nonalcoholic Fatty Liver Disease: A Randomized, Controlled Trial”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Treatment
    • Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
  • Study Primary Completion Date: October 2006

Detailed Description

InChildren or adolescents with well-characterized and liver biopsy confirmed NAFLD will be enrolled. They will be randomized to treatment with alpha tocopherol 600 IU/d plus ascorbic acid 500 mg/d (n=45) or an identical placebo (n=45) given orally. All patients will be included in a lifestyle intervention program consisting of a diet tailored on the individual requirements and physical exercise. The body mass index (BMI) and BMI Z-score will be calculated . Obesity was defined for a percentile of BMI ≥ 95th percentile for age and gender .

Patients will undergo a medical evaluation every three months during the 24-month study period. Laboratory tests including liver enzymes and lipids will be repeated at 3-month intervals during the 24-month study duration. Ultrasonography of the liver will be repeated at the end of the study period.

Evaluation of Glucose Metabolism and Insulin Sensitivity A 2-hour oral glucose tolerance test (OGTT) will be performed at baseline and repeated at 24 mo. of treatment with the standard 1.75 g of glucose per kg, or maximum of 75 g. Glucose tolerance status will be determined according to the classification of the American Diabetes Association in which fasting plasma glucose (FPG) levels up to 99 mg/dl are considered normal; impaired fasting glucose (IFG) is defined by a FPG of 100-125 mg/dl; impaired glucose tolerance (IGT) is defined by a 2-hour plasma glucose of 140-199 mg/dl; diabetes mellitus is defined by a FPG ≥126 mg/dl, or a 2-hour plasma glucose ≥200 mg/dl .

The degrees of insulin resistance and sensitivity will be determined, respectively, by the homeostatic model assessment (HOMA-IR) using the formula: IR = (insulin*glucose)/22.5; and by the insulin sensitivity index (ISI) derived from OGTT using the formula: ISI = (10,000/square root of [fasting glucose x fasting insulin] x [mean glucose x mean insulin during OGTT]).

Liver biopsy Liver biopsy will be performed at baseline and repeated at 24 mo. of treatment. Biopsies will be routinely processed and analyzed as described previously. Pre- and post-treatment liver biopsies will be reviewed and scored by a single pathologist who will be unaware of the assigned treatment, patients' clinical and laboratory data, and liver biopsy sequence. The main histological features of NAFLD including steatosis (macro and microvesicular), inflammation (portal and lobular), hepatocyte ballooning, and fibrosis will be scored using the scoring system for NAFLD recently proposed by the NIH-sponsored NASH Clinical Research Network.

Interventions

  • Dietary Supplement: Vitamin treatment (alpha tocopherol plus ascorbic acid)
    • alpha tocopherol 600 IU/d plus ascorbic acid 500 mg/d and lifestyle intervention [hypocaloric Diet(25-30 cal/kg/d) or isocaloric (40-45 cal/kg/d) and physical activity].
  • Dietary Supplement: Placebo
    • placebo and lifestyle intervention [hypocaloric Diet(25-30 cal/kg/d) or isocaloric (40-45 cal/kg/d) and physical activity].

Arms, Groups and Cohorts

  • Experimental: Vitamin group
    • alpha tocopherol 600 IU/d plus ascorbic acid 500 mg/d and lifestyle intervention [hypocaloric Diet(25-30 cal/kg/d) or isocaloric (40-45 cal/kg/d) and physical activity].
  • Placebo Comparator: 2
    • placebo and lifestyle intervention [hypocaloric Diet(25-30 cal/kg/d) or isocaloric (40-45 cal/kg/d) and physical activity].

Clinical Trial Outcome Measures

Primary Measures

  • serum levels of aminotransferases
    • Time Frame: months 12 and 24

Secondary Measures

  • Liver histology (inflammation and fibrosis)
    • Time Frame: month 24

Participating in This Clinical Trial

Inclusion Criteria

  • persistently elevated serum aminotransferase levels,
  • diffusely echogenic liver on imaging studies suggestive of fatty liver, and
  • biopsy consistent with the diagnosis of NAFLD.

Exclusion Criteria

  • hepatic virus infections (HCV RNA-PCR negative),
  • Hepatitis A, B, C, D, E and G,
  • cytomegalovirus and Epstein-Barr virus,
  • alcohol consumption,
  • history of parenteral nutrition,
  • and use of drugs known to induce steatosis (e.g. valproate, amiodarone or prednisone) or to affect body weight and carbohydrate metabolism.
  • Autoimmune liver disease, metabolic liver disease, Wilson's disease, and a-1-antitrypsin-associated liver disease were ruled out using standard clinical, laboratory and histological criteria.

Gender Eligibility: All

Minimum Age: 3 Years

Maximum Age: 20 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Bambino Gesù Hospital and Research Institute
  • Provider of Information About this Clinical Study
    • Valerio Nobili, MD, Bambino Gesù Hospital and Research Institute
  • Overall Official(s)
    • Valerio Nobili, MD, Principal Investigator, Bambino Gesù Hospital and Research Institute

References

Bugianesi E, Gentilcore E, Manini R, Natale S, Vanni E, Villanova N, David E, Rizzetto M, Marchesini G. A randomized controlled trial of metformin versus vitamin E or prescriptive diet in nonalcoholic fatty liver disease. Am J Gastroenterol. 2005 May;100(5):1082-90.

Vajro P, Mandato C, Franzese A, Ciccimarra E, Lucariello S, Savoia M, Capuano G, Migliaro F. Vitamin E treatment in pediatric obesity-related liver disease: a randomized study. J Pediatr Gastroenterol Nutr. 2004 Jan;38(1):48-55.

Lavine JE. Vitamin E treatment of nonalcoholic steatohepatitis in children: a pilot study. J Pediatr. 2000 Jun;136(6):734-8.

Citations Reporting on Results

Nobili V, Manco M, Devito R, Ciampalini P, Piemonte F, Marcellini M. Effect of vitamin E on aminotransferase levels and insulin resistance in children with non-alcoholic fatty liver disease. Aliment Pharmacol Ther. 2006 Dec;24(11-12):1553-61.

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