A Study of PEGASYS (Peginterferon Alfa-2a (40KD)) Plus COPEGUS (Ribavirin) With or Without Pioglitazone in Treatment-Naive Patients With Chronic Hepatitis C and Insulin Resistance.

Serum samples were collected for HCV RNA. The change from Initiation of Pegasys Plus Copegus to Week 24 and Week 48 in HCV RNA titers were calculated. Randomization for the with Pioglitazone arm occurred prior to the 16 week run-in period and randomization for the without Pioglitazone arm occurred prior to the start of anti-HCV treatment.

Virologic response was defined as undetectable HCV RNA < 28 IU/mL. Patients with missing HCV RNA values are considered as non-responders.

Serum samples were collected for HCV RNA. The percentage of participants with a ≥ 2 log10 decrease in HCV RNA from initiation of Pegasys plus Copegus to time point was calculated.

Virologic relapse was defined as the reappearance of HCV-RNA in serum after PEG-INF alpha 2a therapy is discontinued in a patient who was HCV-RNA undetectable at the completion of anti-HCV therapy.

Virological breakthrough is a detectable HCV RNA at any time during anti-HCV treatment up to Week 48 after the attainment of undetectable HCV RNA.

Nonresponders are defined as patients who did not achieve undetectable HCV RNA during anti-HCV treatment

Serum HCV RNA was collected at randomization and during the pioglitazone run-in period at various time points for the with pioglitazone arm only. The change from randomization to each of these time points was calculated.

Blood was collected for plasma fasting glucose levels at various time points throughout the study and was used as a measure of glycemic control (monitoring the ability of the patient to maintain normal blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for fasting insulin levels at various time points throughout the study and was used as a measure of glycemic control (monitoring the ability of the patient to maintain normal blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for a fasting Hemoglobin A1C level at various time points throughout the study and was used as a measure of glycemic control (monitoring the ability of the patient to maintain normal blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Insulin resistance (IR) is calculated using the following formula:

HOMA score = (fasting glucose in mg/dL × fasting insulin in μIU/mL) / 405.

Baseline for "with pioglitazone" arm occurred prior to the start of 16 week run-in period and for "without pioglitazone" arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the start of anti-HCV therapy is calculated.

A normal patient can have a HOMA score up to 3. A patient with a score of >3 is definitely IR. Patients scoring 2-3 can be IR but other factors may be causing this without being IR.

Blood was collected and assayed for fasting serum triglyceride levels at various time points throughout the study and was used as an indicator of lipid control.

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected and assayed for fasting serum cholesterol levels at various time points throughout the study and was used as an indicator of lipid control.

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected and assayed for fasting serum low-density lipoprotein (LDL-cholesterol) levels at various time points throughout the study and was used as an indicator of lipid control.

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected and assayed for fasting high-density lipoprotein (HDL-cholesterol) levels at various time points throughout the study and was used as an indicator of lipid control.

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for tumor necrosis factor alpha at various time points throughout the study and was used as a measure of insulin resistance (the inability of insulin to control blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for Transforming Growth Factor beta at various time points throughout the study and was used as a measure of insulin resistance (the inability of insulin to control blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for adiponectin at various time points throughout the study and was used as a measure of insulin resistance (the inability of insulin to control blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for leptin at various time points throughout the study and was used as a measure of insulin resistance (the inability of insulin to control blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

Blood was collected for free fatty acids at various time points throughout the study and was used as a measure of insulin resistance (the inability of insulin to control blood sugar levels).

Baseline for the with pioglitazone arm occurred prior to the start of 16 week run-in period and for the without pioglitazone arm prior to the start of anti-HCV therapy. The change from baseline to Weeks 4 thru 72 after the initiation of anti-HCV therapy is calculated.

The BDI-FS consisted of seven areas with four statements (labeled 0, 1, 2, and 3) offered to describe the area of interest, with 0 indicating no effect and 3 indicating the worst effect. The individual area scores were summed to provide a total score. The degree of depression was assessed with 0 to 3 indicating minimal depression, 4 to 8 mild depression, 9 to 12 moderate depression and 13 to 21 severe depression.