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BACKGROUND: Many epidemiological studies have demonstrated a significant association between Type 2 diabetes mellitus and abnormal lipid profiles with chronic HCV genotype 1 (GT1) infection. We examined the impact on glucose and lipid profiles of treating Chinese patients using pegylated interferon (Peg-IFN)-α and ribavirin (RBV). METHODS: We conducted a hospital-based clinical study of Chinese patients chronically infected with GT1b HCV. All the patients were treated for 48 weeks (PR48) with Peg-IFN-α (180 μg once per week) or Peg-IFN-α (1.5 μg/kg once per week) plus RBV (15 mg/kg per day)). Fasting blood glucose (FBG), postprandial blood glucose (PBG-2h), glycosylated hemoglobin (HbA1c), total cholesterol (TC) and triglyceride (TG) levels, were measured at baseline, during therapy, at the end of therapy and at follow-up. In addition, liver stiffness (LS) by transient elastography, HCV RNA and ALT levels were also measured. RESULTS: We enrolled 116 patients. At the end of treatment (EOT) (week 48), HCV RNA was negative in all patients, 77.6% (90/116) of patients achieved sustained virologic response (SVR) 24 weeks after EOT, and 22.4% (26/116) did not achieve SVR. All parameters associated with liver inflammation, liver fibrosis, glucose and lipid metabolism had decreased significantly compared with baseline (P