Long-term Role of Pioglitazone in Non-Alcoholic Fatty Liver Disease (NAFLD) in Type 2 Diabetes Mellitus (T2DM).
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 入组人数
- 176
- 试验地点
- 1
- 主要终点
- Liver Histology (Using Kleiner et al Criteria, Hepatology 2005)
研究概览
简要总结
Obesity and Type 2 diabetes are creating a silent epidemic, Non-alcoholic fatty liver disease, which is a chronic liver disease associated with insulin resistance, impaired glucose intolerance, and hepatic fat accumulation. The thiazolidinedione pioglitazone improves glucose/lipid metabolism and histology in NASH by improving insulin resistance in the liver/peripheral/adipose tissues and reducing subclinical inflammation. The aim of this study is to assess the underlying mechanisms at the clinical and molecular level and the long-term efficacy and safety of pioglitazone in NASH in a multiethnic cohort of subjects (predominantly Hispanics, Caucasians and African-Americans - the most common ethnic groups locally) and examine the response including patients with normal glucose tolerance, impaired glucose tolerance or established type 2 diabetes mellitus (T2DM).
详细描述
NASH is a disease characterized by elevated plasma aminotransferases and histopathological changes in liver characterized by hepatocellular steatosis, chronic inflammation and perisinusoidal fibrosis. NASH affects (~30-40%) of obese and type 2 diabetic subjects. While the pathogenesis of NASH is poorly understood, there is consensus that insulin resistance and its associated abnormalities in lipid metabolism play a key role in the development of liver fat accumulation. Insulin resistance in nonalcoholic steatohepatitis is frequently associated with chronic hyperinsulinemia, hyperglycemia, and an excessive supply of plasma free fatty acids to the liver. This in turn promotes hepatic lipogenesis. Pioglitazone, a thiazolidinedione (TZD), reverses these abnormalities by ameliorating insulin resistance in adipose tissue, liver and muscle. TZDs decrease excessive ectopic triglyceride accumulation in liver and muscle, reduce visceral fat, and redistribute fat to subcutaneous adipose stores. We have shown in a proof-of-concept 6-month study that pioglitazone is safe and effective for the treatment of T2DM. Patients with nonalcoholic steatohepatitis are also characterized by a low plasma adiponectin level. Thiazolidinediones increase plasma adiponectin levels, may activate AMP-activated protein kinase, stimulate hepatic/muscle fatty acid oxidation, and inhibit hepatic fatty acid synthesis in NASH nonalcoholic steatohepatitis. Thiazolidinediones also have antiinflammatory effects which are believed to be of value for therapy for NASH.
In order to evaluate this hypothesis, the investigators will treat for up to 36 months a group of patients with impaired (IGT) glucose tolerance and T2DM patients recruited from the University Hospital and medical school clinics and by newspaper add targeting the San Antonio and South Texas geographical area, with pioglitazone in a randomized, double-blinded, placebo-controlled trial. The primary endpoint will be liver histologic response assessed by liver biopsy performed at 18 and at 36 months of treatment.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 70 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Be able to communicate meaningfully with the investigators and be legally competent to provide written informed consent.
- •Age range between 18 to 70 years (inclusive).
- •Female patients must be non-lactating and must either be at least one year post-menopausal, or be using adequate mechanical contraceptive precautions (i.e. intrauterine device, diaphragm with spermicide, condom with spermicide), or be surgically sterilized (i.e. bilateral tubal ligation, bilateral oophorectomy). Female patients who have undergone a hysterectomy are eligible for participation in the study. Female patients (except for those patients who have undergone a hysterectomy or a bilateral oophorectomy) are eligible only if they have a negative pregnancy test throughout the study period. Patients on oral contraceptives or an hormonal implant will be excluded (patches are acceptable as they deliver much lower estrogen systemically).
- •Participants must have the following laboratory values:
- •Hemoglobin ≥ 12 gm/dl in males, or ≥ 11 gm/dl in females,
- •WBC count ≥ 3,000/mm3
- •Neutrophil count ≥ 1,500/mm3
- •Platelets ≥ 100,000/mm3
- •Albumin ≥3.0 g/dl
- •Serum creatinine ≤ 1.8 mg/dl
- •Creatinine phosphokinase ≤ 2 times upper limit of normal
- •AST and ALT ≤ 3.0 times upper limit of normal
- •Alkaline phosphatase ≤ 2.5 times upper limit of normal
- •A diagnosis of NASH by liver biopsy performed within the past 6 months,
排除标准
- •Any cause of chronic liver disease other than NASH (such as -but not restricted to- alcohol or drug abuse, medication, chronic hepatitis B or C, autoimmune, hemochromatosis, Wilson's disease, alpha1-antitrypsin deficiency).
- •Any clinical evidence or history of ascitis, bleeding varices, or spontaneous encephalopathy.
- •Current history of alcohol abuse (alcohol consumption greater than 20 grams of ethanol per day).
- •Prior surgical procedures to include gastroplasty, jejuno-ileal or jejunocolic bypass.
- •Prior exposure to organic solvents such as carbon tetrachloride.
- •Total parenteral nutrition (TPN) within the past 6 months.
- •Subjects with type 1 diabetes mellitus.
- •Patients on chronic medications with known adverse effects on glucose tolerance levels unless the patient has been on a stable dose of such agents for 4 weeks before entry into the study. Patients on estrogens or other hormonal replacement therapy, tamoxifen, raloxifene, oral glucocorticoids or chloroquine will be excluded.
- •Patients with a history of clinically significant heart disease (New York Heart Classification greater than grade II), peripheral vascular disease (history of claudication), or diagnosed pulmonary disease (dyspnea on exertion of one flight or less; abnormal breath sounds on auscultation).
- •Patients with severe osteoporosis.
研究组 & 干预措施
Pioglitazone
After all patients receive dietary counseling at the research unit (CTSA), patients with prediabetes or type 2 diabetes mellitus (T2DM) and NASH will be started on pioglitazone (or placebo) in a randomized, double-blind,placebo-controlled study design. Pioglitazone will be given at 30 mg/day for the first 2 months and titrated to 45 mg/day thereafter (if well tolerated).
干预措施: Pioglitazone study drug (Drug)
Pioglitazone
After all patients receive dietary counseling at the research unit (CTSA), patients with prediabetes or type 2 diabetes mellitus (T2DM) and NASH will be started on pioglitazone (or placebo) in a randomized, double-blind,placebo-controlled study design. Pioglitazone will be given at 30 mg/day for the first 2 months and titrated to 45 mg/day thereafter (if well tolerated).
干预措施: Pioglitazone Open Label (Drug)
Placebo
After dietary counseling to all patients at the research unit (CTSA), patients with prediabetes or type 2 diabetes mellitus (T2DM) and NASH will be started on pioglitazone (or placebo) in a randomized, double-blind,placebo-controlled study design. Pioglitazone will be given at 30 mg/day for the first 2 months and titrated to 45 mg/day thereafter (if well tolerated).
干预措施: Placebo (Drug)
Placebo
After dietary counseling to all patients at the research unit (CTSA), patients with prediabetes or type 2 diabetes mellitus (T2DM) and NASH will be started on pioglitazone (or placebo) in a randomized, double-blind,placebo-controlled study design. Pioglitazone will be given at 30 mg/day for the first 2 months and titrated to 45 mg/day thereafter (if well tolerated).
干预措施: Pioglitazone Open Label (Drug)
结局指标
主要结局
Liver Histology (Using Kleiner et al Criteria, Hepatology 2005)
时间窗: At 18 months
Number of patients with reduction of at least 2 points in the nonalcoholic fatty liver disease activity score (NAS) (with reduction in at least 2 different histological categories) without worsening of fibrosis. NAS is the sum of the separate scores for steatosis (0-3), hepatocellular ballooning (0-2) and lobular inflammation (0-3), and ranges from 0-8 . The scoring system is based on the following grading: Steatosis: 0 = \<5%; 1 = 5-33%; 2 = \>33-66%; 3 = \>66%. Lobular Inflammation: 0 = No foci 1 = \<2 foci/200x; 2 = 2-4 foci/200x, 3 = \>4 foci/200x. Hepatocyte Ballooning: 0 = None; 1 = Few balloon cells; 2 = Many cells/prominent ballooning. Fibrosis: 0 = None; 1 = Perisinusoidal or periportal; 2 = Perisinusoidal and portal/periportal; 3 = Bridging fibrosis, 4 = Cirrhosis.
次要结局
- Number of Participants With Resolution of NASH(Month 18)
- Mean Individual Histological Scores(Month 36)
- Individual Histological Scores(Month 18)
- Liver Transaminases (AST and ALT).(18 and 36 months)
- Liver Fat by Magnetic Resonance and Spectroscopy (MRS).(18 months)
- Homeostatic Model Assessment of Insulin Resistance (HOMA-IR)(18 and 36 months)
- Hepatic Insulin Sensitivity(18 months)
- Adipose Tissue Insulin Sensitivity(18 months)
- Skeletal Muscle Insulin Sensitivity(18 months)
- Body Mass Index (BMI)(Months 18 and 36)
- Total Body Fat(Months 18)
- Plasma Biomarkers Relevant to Hepatic Inflammation, Apoptosis and Fibrosis (Adiponectin).(18 and 36 months)
- Plasma Biomarkers Relevant to Hepatic Inflammation, Apoptosis and Fibrosis (CK-18).(18 and 36 months)
- Prevention of the Onset of T2DM and/or Reversal From IFG/IGT to NGT in Non-diabetics.(18 months)
- Osteoporotic Fractures(18 and 36 months)
- Molecular Pathways of Liver Glucose and Lipid Signaling; Inflammatory Pathways; Oxidative Stress; Other.(At 18 (2nd liver biopsy) and 36 (3rd liver biopsy) months.)
- Bone Mineral Density(18 and 36 months)