The Efficacy and Safety of Pioglitazone in Patients With Nonalcoholic Steatohepatitis

Main inclusion criteria: 1. Male and female patients with 18-70 years of age 2. Liver biopsy findings consistent with the diagnosis of NASH with or without compensated cirrhosis within one year before baseline 3. Compensated liver disease 4. Negative urine or blood pregnancy test (for women of childbearing potential) documented within the 24-hour period prior to the first dose of study drug 5. All fertile males and females must be using two forms of effective contraception during treatment during the 3 months after treatment. 6. ALT level between 1.3-5 x ULN for 2 occasions during 6 months before screening. 7. HbA1C ≦ 8.0 during screening Main exclusion criteria: 1. Therapy with any systemic anti-neoplastic or immunomodulatory treatment (including supraphysiologic doses of steroids and radiation) \*6 months before baseline. 2. History or other evidence of a medical condition associated with chronic liver disease other than NASH (e.g., hemochromatosis, autoimmune hepatitis, alcoholic liver disease, \> 20 g/day for female or \> 40 g/day for male, toxin exposures) 3. hepatocellular carcinoma 4. History or other evidence of bleeding from esophageal varices or other conditions consistent with decompensated liver disease 5. Serum creatinine level \>1.5 times the upper limit of normal at screening and calculated creatinine clearance as calculated by Cockcroft and Gault \< 60mL/min during screening 6. History of ischemic heart disease during screening 7. New York Heart Association (NYHA) Functional Class 1-4 cardiac status during screening 8. Albumin \<3.2g/dL during screening 9. Total bilirubin \>1.2 x ULN during screening. Patients with history of asymptomatic indirect hyperbilirubinemia whose total bilirubin \< 2 x ULN and direct bilirubin \< 20% of total bilirubin could be included. 10. History of prothrombin time \> 15 seconds or International normalized ratio (INR) \> 1.3 11. Organ, stem cell, or bone marrow transplant 12. History of serious concurrent medical illness that in the investigator's opinion might interfere with therapy this includes significant systemic illnesses (other than liver disease) such as chronic pancreatitis 13. Active systemic autoimmune disorder 14. Pregnancy (or lactation) or, in subjects capable of bearing children, inability / unwillingness to practice adequate contraception 15. Females of child-bearing potential (post-puberty) unwilling or unable to have pregnancy testing at any study visit 16. Therapy with a systemic antiviral agent (with the exception of prophylaxis or treatment of influenza or chronic HSV) within the past 30 days prior to screening. 17. Concurrent participation in another clinical trial in which the subject is or will be exposed to another investigational or a non-investigational drug or device within 6 weeks of the screening visit 18. Current therapy with insulin within 1 week prior to screening. 19. Experienced use with PPARg agonist (e.g., rosiglitazone, pioglitazone) within 6 months prior to screening. 20. Known hypersensitivity to any component of PPARg agonists 21. A history of hepatotoxicity to TZDs and/or a history of severe edema or a medically serious fluid-related event associated with the use of TZDs 22. History of metformin use within 3 months prior to screening. 23. Type Ⅰ diabetes 24. Seropositive of HBsAg, anti-HCV or anti-HIV during screening or 3 month prior to screening.