Primary Outcomes

Description: Participants with SVR were defined as those with undetectable Hepatitis C Virus (HCV) ribonucleic acid (RNA) at 24 weeks post-completion of the treatment period of the DB Phase.

Measure: Number of Participants With Sustained Virologic Response (SVR) in the Double-blind (DB) Antiviral Treatment Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Secondary Outcomes

Description: Participants were assessed for a shift from a baseline platelet count of <75 Gi/L to a count >=90 Gi/L during the OL Phase (up to 9 weeks). Local laboratories were used for platelet function tests. Platelet counts were measured by blood draw.

Measure: Number of Participants Whose Platelet Count Increased From a Baseline Count of <75 Gi/L to a Count Greater Than or Equal to (>=) 90 Giga (10^9) Cells Per Liter (Gi/L) During the Open-label (OL) Pre-Antiviral Treatment Phase

Time: From Baseline up to Week 9 in the OL Phase

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Description: In the OL Phase, participants initially received the lowest dose of eltrombopag (25 mg QD) for 2 weeks. If after this time the platelet count was <90 Gi/L, participants underwent sequential dose escalation to the next highest dose (50 mg QD for up to 2 weeks), with further dose escalations to 75 mg QD (up to 2 weeks) and 100 mg QD (up to a maximum of 3 weeks) if platelet counts remained <90 Gi/L. Participants who achieved platelet count >=90 Gi/L on any of the eltrombopag doses in the OL Phase initiated antiviral therapy in the DB Phase.

Measure: Number of Participants Receiving the Indicated Doses of Eltrombopag in the OL Phase Who Initiated Antiviral Therapy (Peginterferon Alfa-2a and Ribavirin) in the DB Phase

Time: From Baseline up to Week 9 in the OL Phase

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Description: Blood taken from peripheral blood vessels was used for the measurement of platelet counts. The Last On Treatment assessment refers to the actual last treatment assessment, not necessarily to the End of Treatment assessment entered by the Investigator.

Measure: Median Platelet Count at the Indicated Time Points During the OL Phase

Time: OL Phase: Baseline; Day 1; Weeks 1, 2, 3, 4, 5, 6, 7, 8, and 9; Antiviral Baseline (up to Week 10); End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 62); 12-week FU (up to Week 70); and 24-week FU (up to Week 82)

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Description: Blood taken from peripheral blood vessels was used for the measurement of platelet counts.

Measure: Median Platelet Count at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The minimum platelet count with antiviral therapy was categorized as follows: <25 Gi/L; >=25 to <50 Gi/L; >=50 to <90 Gi/L; >=90 to <150 Gi/L; >=150 Gi/L to <200 Gi/L; >=200 Gi/L to <400 Gi/L; and >=400 Gi/L.

Measure: Number of Participants in the Indicated Categories for Minimum Platelet Count With Antiviral Therapy During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: RVR is defined as the absence of detectable HCV RNA after 4 weeks of antiviral treatment. eRVR is defined as the absence of detectable HCV RNA after 4 weeks of antiviral treatment that persisted through Week 12.

Measure: Number of Participants With Rapid Virological Response (RVR) and Extended RVR (eRVR) During the DB Phase

Time: From Baseline up to Week 12

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Description: EVR is defined as a clinically significant reduction from Baseline in HCV RNA (>=2 log10 decrease in HCV RNA or undetectable HCV RNA) after 12 weeks of antiviral treatment. cEVR, a subset of EVR, is defined exclusively as undetectable HCV RNA after 12 weeks of antiviral treatment.

Measure: Number of Participants With Early Virological Response (EVR) and Complete EVR (cEVR) During the DB Phase

Time: From Baseline up to Week 12

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Description: ETR is defined as the absence of detectable HCV RNA at the end of antiviral treatment. SVR12 is defined as the absence of detectable HCV RNA at the end of antiviral treatment and the 12-week follow-up assessment.

Measure: Number of Participants With End of Treatment Response (ETR) and Sustained Virological Response at Week 12 of Follow-up (SVR12) During the DB Phase

Time: From Baseline up to Week 36 or Week 60 (for participants with Genotype 2/3) or up to Week 60 (for participants with Non-Genotype 2/3)

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Description: Participants were assigned a score equal to the number of times their dose of antiviral therapy (peginterferon or ribavirin) was reduced (0=no dose reductions [DRs]; 1=one DR; 2=two DRs; 3=three DRs; >3=more than three DRs). Where possible, every effort was made to maintain the recommended dose of antiviral therapy for the treatment duration in the DB Phase. However, where dose modification of antiviral therapy was required due to safety concerns, it was performed by the Investigator as per the region-specific product labels of peginterferon and ribavirin.

Measure: Number of Participants in the Indicated Categories for Antiviral Therapy Dose Reductions in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Time to first dose reduction was calculated as the time period from the first dose to the first dose reduction.

Measure: Time to First Dose Reduction of Peginterferon Alfa-2a and Ribavirin Therapy in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: The assigned dose in the DB Phase of peginterferon alfa-2a was 180 micrograms (mcg). For peginterferon dose modification, downward adjustments in one level increments was considered. The lowest dose of peginterferon alfa-2a that was allowed to be administered was 45 mcg. Where dose adjustment was required for moderate to severe adverse reactions (clinical and/or laboratory), an initial dose reduction to 135 mcg was generally adequate. In some cases, a dose reduction to 90 mcg or 45mcg was necessary. Dose increases toward the original dose were considered when the adverse reaction was resolved.

Measure: Number of Participants With the Indicated Levels of Peginterferon Dose Reductions in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: The following participants were considered to have discontinued from antiviral therapy: participants who were lost to follow-up; participants who withdrew for any reason; participants who died; participants who otherwise did not complete their planned course of antiviral therapy for any reason. The planned duration of antiviral therapy was 48 weeks for participants with Non-Genotype 2/3 and 24 or 48 weeks for participants with Genotype 2/3.

Measure: Number of Participants Who Prematurely Discontinued Antiviral Therapy in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: There are two genetic variants (rs12979860 and rs8099917) mapping near IL28B associated with both interferon-induced SVR and spontaneous HCV clearance. Genotyping of the IL28B polymorphisms (rs12979860 and rs8099917) was conducted. IL28B genotype distribution by response to antiviral therapy (SVR and RVR) for both treatment arms was assessed. The effect of genotype was tested by comparing participants that carried 2 copies of the IL28B favorable response allele versus the others (recessive model). Genotypes at rs12979860 were coded as: CC=1, CT or TT=0; rs8099917 was coded as TT=1, GT or GG=0.

Measure: Number of Participants (Par.) Categorized as Responders (R) and Non-responders (NR) for SVR and RVR to Antiviral Therapy in the Indicated Variants of Interleukin 28B (IL28B) (or Interferon, Lambda 3) During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Blood samples for the assessment of clinical chemistry parameters were taken at intervals throughout the study. Participants with the worst-case shift from BL during the DB Phase are reported, per severity grades by DAIDS, for levels of calcium (low=hypocalcemia; high=hypercalcemia), glu. (low=hypoglycemia; high=hyperglycemia), pot. (low=hypokalemia; high=hyperkalemia), and sod. (low=hyponatremia; high=hypernatremia). Per the DAIDS toxicity table, the grade ranges for each parameter are as follows: Grade (G) 1=mild; G2=moderate; G3=severe; G4=potentially life-threatening.

Measure: Number of Par. With the Indicated Shift From Baseline (BL) in Severity Grades for Clinical Chemistry Parameters (Calcium, Glucose [Glu.], Potassium [Pot.], and Sodium [Sod.]), Per Division of Acquired Immunodeficiency Syndrome (DAIDS) During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Blood samples for the assessment of hematology parameters were taken at intervals throughout the study. Participants with the worst-case shift from BL during the DB Phase are reported, per severity grades by DAIDS, for levels of hemoglobin (low=anemia), lymphocytes (low=lymphocytopenia), total neutrophils (low=neutropenia), and white blood cells (low=leukocytopenia). Per the DAIDS toxicity table, grade ranges for each parameter are as follows: Grade (G) 1=mild; G2=moderate; G3=severe; G4=potentially life-threatening.

Measure: Number of Participants With the Indicated Shifts From BL in Severity Grades for for Hematology Parameters (Hemoglobin, Lymphocytes [Lym.], Total Neutrophils [Tot Neu.], and White Blood Cells [WBC]), Per DAIDS During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Ophthalmic (pertaining to eye) assessments were performed during the study. A cataract event is defined as an event ascertained to be a cataract (opacity or cloudiness of the lens of the eye, causing impairment of vision) by at least one of the CEC members (comprised of expert ophthalmologists who provided objective medical review of the blinded ophthalmic data). Per the CEC, cataract events were categorized as: (1) Cataract Progression (CP; progression of cataracts present at BL); and (2) Incident Cataract (IC; development of new cataracts). One eye=unilateral; both eyes=bilateral.

Measure: Number of Participants in the Indicated Categories for Cataract Event During the DB Phase, Per Clinical Events Committee (CEC) Adjudication During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Duplicate 12-lead ECGs were required at Screening/BL, Antiviral BL, and at 12 weekly intervals during the study. The investigator assigned an ECG status of normal, abnormal, CS, or NCS; a status of "abnormal" alone indicates that the investigator did not determine if ECG was CS or NCS. Normal, all ECG parameters within accepted normal ranges. Abnormal, ECG finding(s) outside of normal ranges. CS, ECG with a CS abnormality that meets exclusion criteria. NCS, ECG with an abnormality not CS or meeting exclusion criteria, per Investigator, based on reasonable standards of clinical judgment.

Measure: Number of Participants Assessed as Normal and Abnormal (Clinically Significant [CS] and Not Clinically Significant [NCS]) for 12-lead Electrocardiogram (ECG) at the Indicated Time Points During the DB Phase

Time: DB Phase: Antiviral BL (up to Week 10); End of Treatment (up to Week 52); and 24-week FU (up to Week 72)

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Description: Duplicate 12-lead ECGs were required at Screening/BL, Antiviral BL, and at 12 weekly intervals during the study. The number of participants with a CS or a NCS change from baseline in ECG status was reported, as determined by the Investigator based on a reasonable standard of clinical judgment. "Not applicable" indicates that information was not provided by the investigator on whether the change from baseline ECG was CS or NCS.

Measure: Number of Participants With CS and NCS Change From Baseline for 12-lead ECG at the Indicated Time Points During the DB Phase

Time: End of Treatment (up to Week 52); and 24-week FU (up to Week 72)

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Description: Participant's blood pressure was measured at the indicated time points during the study. Systolic blood pressure is a measure of blood pressure while the heart is beating. Diastolic blood pressure is a measure of blood pressure while the heart is relaxed. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: Heart rate was measured in participants at the indicated time points. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Heart Rate at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The weight of participants was recorded at the indicated time points. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Weight at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The BMI for participants was calculated at the indicated time points as body weight in kilograms divided by height in meters squared. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Body Mass Index (BMI) at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Primary Outcomes

Description: Participants with SVR are defined as those with non-detectable Hepatitis C Virus (HCV) ribonucleic acid (RNA) at the end of treatment and all subsequent planned visits up to 24 weeks post-completion of the treatment period of the DB Phase.

Measure: Number of Participants With Sustained Virologic Response (SVR) in the Double-blind (DB) Antiviral Treatment Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Secondary Outcomes

Description: Participants were assessed for a shift from a baseline platelet count of <75 Gi/L to a count >=100 Gi/L during the OL Phase (up to 9 weeks). Local laboratories were used for platelet function tests. Platelet counts were measured by blood draw.

Measure: Number of Participants Whose Platelet Count Increased From a Baseline Count of <75 Gi/L to a Count Greater Than or Equal to (>=) 100 Giga (10^9) Cells Per Liter (Gi/L) During the Open-label (OL) Pre-Antiviral Treatment Phase

Time: From Baseline up to Week 9 in the OL Phase

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Description: In the OL Phase, participants initially received the lowest dose of eltrombopag (25 mg QD) for 2 weeks. If after this time the platelet count was <100 Gi/L, participants underwent sequential dose escalation to the next highest dose (50 mg QD for up to 2 weeks), with further dose escalations to 75 mg QD (up to 2 weeks) and 100 mg QD (up to a maximum of 3 weeks) if platelet counts remained <100 Gi/L. Participants who achieved platelet counts >=100 Gi/L when receiving any of the eltrombopag doses in the OL Phase initiated antiviral therapy in the DB Phase.

Measure: Number of Participants Receiving the Indicated Doses of Eltrombopag in the OL Phase Who Initiated Antiviral Therapy (Peginterferon Alfa-2a and Ribavirin) in the DB Phase

Time: From Baseline up to Week 9 in the OL Phase

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Description: Blood taken from peripheral blood vessels was used for the measurement of platelet counts. The Last On Treatment assessment refers to the actual last treatment assessment, not necessarily to the End of Treatment assessment entered by the Investigator.

Measure: Median Platelet Count at the Indicated Time Points During the OL Phase

Time: OL Phase: Baseline; Day 1; Weeks 1, 2, 3, 4, 5, 6, 7, 8, and 9; Antiviral Baseline (up to Week 10); End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 62); 12-week FU (up to Week 70); and 24-week FU (up to Week 82)

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Description: Blood taken from peripheral blood vessels was used for the measurement of platelet counts. The Last On Treatment assessment refers to the actual last treatment assessment, not necessarily to the End of Treatment assessment entered by the Investigator.

Measure: Median Platelet Count at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The minimum platelet count with antiviral therapy was categorized as follows: <25 Gi/L; >=25 to <50 Gi/L; >=50 to <90 Gi/L; >=90 to <150 Gi/L; >=150 Gi/L to <200 Gi/L; >=200 Gi/L to <400 Gi/L; and >=400 Gi/L.

Measure: Number of Participants in the Indicated Categories for Minimum Platelet Count With Antiviral Therapy

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: RVR is defined as the absence of detectable HCV RNA after 4 weeks of antiviral treatment. eRVR is defined as the absence of detectable HCV RNA after 4 weeks of antiviral treatment that persisted through Week 12.

Measure: Number of Participants With Rapid Virological Response (RVR) and Extended RVR (eRVR) During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: EVR is defined as a clinically significant reduction from Baseline in HCV RNA (>=2 log10 drop or undetectable) after 12 weeks of antiviral treatment. cEVR is defined as undetectable HCV RNA after 12 weeks of antiviral treatment.

Measure: Number of Participants With Early Virological Response (EVR) and Complete EVR (cEVR) During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: ETR is defined as the absence of detectable HCV RNA at the end of antiviral treatment. SVR12 is defined as the absence of detectable HCV RNA at the end of antiviral treatment and the 12-week follow-up assessment.

Measure: Number of Participants With End of Treatment Response (ETR) and Sustained Virological Response at Week 12 of Follow-up (SVR12) During the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Participants were assigned a score equal to the number of times their dose of antiviral therapy (peginterferon or ribavirin) was reduced (0=no dose reductions [DRs]; 1=one DR; 2=two DRs; 3=three DRs; >3=more than three DRs). When possible, every effort was made to maintain the recommended dose of antiviral therapy for the treatment duration in the DB Phase. However, when dose modification of antiviral therapy was required due to safety concerns, it was performed by the Investigator as per the region-specific product labels of peginterferon and ribavirin.

Measure: Number of Participants in the Indicated Categories for Antiviral Therapy Dose Reductions in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Time to first dose reduction was calculated as the time period from the first dose to the first dose reduction.

Measure: Time to First Dose Reduction of Peginterferon Alfa-2a and Ribavirin Therapy in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: The assigned dose in the DB Phase of peginterferon alfa-2a was 180 micrograms (µg). For peginterferon dose modification, downward adjustments in one-level increments were considered. The lowest dose of peginterferon alfa-2a that was allowed to be administered was 45 µg. When dose adjustment was required for moderate to severe adverse reactions (clinical and/or laboratory), an initial dose reduction to 135 µg was generally adequate. In some cases, a dose reduction to 90 µg or 45 µg was necessary. Dose increases toward the original dose were considered when the adverse reaction was resolved.

Measure: Number of Participants With the Indicated Levels of Peginterferon Dose Reductions in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: The following participants were considered to have discontinued antiviral therapy: participants who were lost to follow-up; participants who withdrew for any reason; participants who died; participants who otherwise did not complete their planned course of antiviral therapy for any reason. The planned duration of antiviral therapy was 48 weeks for participants with Non-Genotype 2/3 and 24 or 48 weeks for participants with Genotype 2/3.

Measure: Number of Participants Who Prematurely Discontinued Antiviral Therapy in the DB Phase

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: There are two genetic variants (rs12979860 and rs8099917) mapping near IL28B associated with both interferon-induced SVR and spontaneous HCV clearance. IL28B genotype distribution by response to antiviral therapy (SVR/RVR responders: those who achieved SVR/RVR; SVR/RVR non-responders: those who did not achieve SVR/RVR) was assessed. The effect of genotype was tested by comparing participants that carried 2 copies of the IL28B favorable response allele versus the others (recessive model). Genotypes at rs12979860 were coded as: CC=1, CT or TT=0; rs8099917 was coded as TT=1, GT or GG=0.

Measure: Number of Participants Categorized as Responders (R) and Non-responders (NR) for SVR and RVR to Antiviral Therapy in the Indicated Variants of Interleukin 28B (IL28B) (or Interferon, Lambda 3)

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Blood samples for the assessment of clinical chemistry parameters were taken at intervals throughout the study. Participants with the worst-case shift from BL during the DB Phase are reported, per severity grades by DAIDS, for levels of calcium (low=hypocalcemia; high=hypercalcemia), glu. (low=hypoglycemia; high=hyperglycemia), pot. (low=hypokalemia; high=hyperkalemia), and sod. (low=hyponatremia; high=hypernatremia). Per the DAIDS toxicity table, the grade ranges for each parameter are as follows: Grade (G) 1=mild; G2=moderate; G3=severe; G4=potentially life-threatening.

Measure: Number of Participants With the Indicated Shift From Baseline (BL) in Severity Grades for Clinical Chemistry Parameters (Calcium, Glucose [Glu.], Potassium [Pot.], and Sodium [Sod.]), Per Division of Acquired Immunodeficiency Syndrome (DAIDS)

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Blood samples for the assessment of hematology parameters were taken at intervals throughout the study. Participants with the worst-case shift from BL during the DB Phase are reported, per severity grades by DAIDS, for levels of hemoglobin (low=anemia), lymphocytes (low=lymphocytopenia), total neutrophils (low=neutropenia), and white blood cells (low=leukocytopenia). Per the DAIDS toxicity table, grade ranges for each parameter are as follows: Grade (G) 1=mild; G2=moderate; G3=severe; G4=potentially life-threatening.

Measure: Number of Participants With the Indicated Shifts From BL in Severity Grades for for Hematology Parameters (Hemoglobin, Lymphocytes [Lym.], Total Neutrophils [Tot Neu.], and White Blood Cells [WBC]), Per DAIDS

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Ophthalmic (pertaining to eye) assessments were performed during the study. A cataract event is defined as an event ascertained to be a cataract (opacity or cloudiness of the lens of the eye, causing impairment of vision) by at least one of the CEC members (comprised of expert ophthalmologists who provided objective medical review of the blinded ophthalmic data). Per the CEC, cataract events were categorized as: (1) Cataract Progression (CP; progression of cataracts present at BL); and (2) Incident Cataract (IC; development of new cataracts). One eye=unilateral; both eyes=bilateral.

Measure: Number of Participants in the Indicated Categories for Cataract Event During the DB Phase, Per Clinical Events Committee (CEC) Adjudication

Time: From Baseline up to Week 48 or Week 72 (for participants with Genotype 2/3) or up to Week 72 (for participants with Non-Genotype 2/3)

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Description: Duplicate 12-lead ECGs were required at Screening/BL, Antiviral BL, and at 12 weekly intervals during the study. The number of participants with an ECG status of normal, abnormal, CS, or NCS, as determined by the Investigator, was reported. Normal, all ECG parameters within accepted normal ranges. Abnormal, ECG finding(s) outside of normal ranges. CS, ECG with a CS abnormality that meets exclusion criteria. NCS, ECG with an abnormality not CS or meeting exclusion criteria, per Investigator, based on reasonable standards of clinical judgment.

Measure: Number of Participants Assessed as Normal and Abnormal (Clinically Significant [CS] and Not Clinically Significant [NCS]) for 12-lead Electrocardiogram (ECG) at the Indicated Time Points During the DB Phase

Time: DB Phase: Antiviral BL (up to Week 10); End of Treatment (up to Week 52); and 24-week FU (up to Week 72)

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Description: Duplicate 12-lead ECGs were required at Screening/BL, Antiviral BL, and at 12 weekly intervals during the study. The number of participants with a CS and a NCS change from baseline in ECG status, as determined by the Investigator, was reported. CS, ECG with a CS abnormality that meets exclusion criteria. NCS, ECG with an abnormality not CS or meeting exclusion criteria, per Investigator, based on reasonable standards of clinical judgment. "Not applicable" indicates that information was not provided by the investigator on whether the change from baseline ECG was CS or NCS.

Measure: Number of Participants With CS and NCS Change From Baseline for 12-lead ECG at the Indicated Time Points During the DB Phase

Time: End of Treatment (up to Week 52); and 24-week FU (up to Week 72)

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Description: Participant's blood pressure was measured at the indicated time points during the study. Systolic blood pressure is a measure of blood pressure while the heart is beating. Diastolic blood pressure is a measure of blood pressure while the heart is relaxed. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: Heart rate was measured in participants at the indicated time points. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Heart Rate at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The weight of participants was recorded at the indicated time points. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Weight at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Description: The BMI for participants was calculated at the indicated time points as body weight in kilograms divided by height in meters squared. Mean change from Baseline was calculated as the value at the indicated time points minus the value at Baseline.

Measure: Mean Change From Baseline in Body Mass Index (BMI) at the Indicated Time Points During the DB Phase

Time: DB Phase: Baseline; Weeks 1, 2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44; End of Treatment (up to Week 48); 4-week Follow-up (FU) (up to Week 52); 12-week FU (up to Week 60); and 24-week FU (up to Week 72)

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Primary Outcomes

Description: Blood HCV RNA copies were assayed with Roche - COBAS® AmpliPrep/COBAS® TaqMan® HCV Test.

Measure: Blood HCV RNA Copies

Time: 0h,8h,10h,12h,18h,24h,37h,43h,3d,7d,2w,4w,6w,12w,24w,48w

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Secondary Outcomes

Description: IL28 gene polymorphism,rs8099917,rs12979860,etc

Measure: IL-28B polymorphism

Time: Baseline

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Description: During the first 3 days, blood samples are collected for PBMC separation and microarray analysis.

Measure: Microarray Analysis of PBMC Gene Expression

Time: Baseline,8h,18h,3d

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Description: HCV NS5A is cloned into T vector and sequenced for evolutionary analysis.

Measure: HCV genotype

Time: Baseline

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Description: Co-infection status are analyzed.

Measure: Blood Anti-HCV,HBV Antibody

Time: Baseline

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Description: Deep sequencing is used for blood serum HCV genome analysis.

Measure: HCV genome sequencing

Time: 0h,8h,10h,12h,18h,24h,37h,43h,3d

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Description: ALT AST are assayed to detect the hepatic function.

Measure: Alanine Aminotransferase (ALT) and Aspartate transaminase (AST)

Time: Baseline,4w,6w,12w,24w,48w

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Description: Fibrosis is analyzed with Fibroscan.

Measure: Fibrosis stage

Time: Baseline,4w,12w,24w,48w

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Description: The distribution and absolute count of the different types of blood cells are assayed.

Measure: Regular blood test

Time: Baseline,4w,12w,24w,48w

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Description: Electrocardiography is taken to avoid severe side effects.

Measure: Electrocardiography

Time: Baseline,4w,12w,24w,48w

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Description: Patients are asked whether they take alcohol or smoke cigarettes during the therapy period.

Measure: Alcohol ,smoking condition

Time: Baseline,4w,12w,24w,48w

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Description: Patients will be asked about their drug usage history.

Measure: Drug abuse history

Time: Baseline

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Primary Outcomes

Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype (Genotype 1 [G1], Genotype 2 [G2], Genotype 3 [G3], Genotype 4 [G4], and all other genotypes [Other]) and cirrhosis status ('Cirrhosis/transition to cirrhosis' or 'No cirrhosis') were obtained from medical records. Cirrhosis status was based upon previous biopsy or noninvasive assessment captured prior to treatment, if applicable.

Measure: Number of Participants With Interleukin 28B (IL28B) Genotype rs12979860 by Cirrhosis Status and Hepatitis C Virus (HCV) Ribonucleic Acid (RNA) Genotype: Treatment-Naive

Time: Study Visit 1 (single study visit)

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and cirrhosis status were obtained from medical records. Cirrhosis status was based upon previous biopsy or noninvasive assessment captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by Cirrhosis Status and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and cirrhosis status were obtained from medical records. Cirrhosis status was based upon previous biopsy or noninvasive assessment captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by Cirrhosis Status and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and cirrhosis status were obtained from medical records. Cirrhosis status was based upon previous biopsy or noninvasive assessment captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by Cirrhosis Status and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage ('Cirrhotic,' 'Transition to cirrhosis,' 'Advanced fibrosis noncirrhotic,' 'Mild/minimal fibrosis,' and 'No fibrosis') were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using these five categories and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage ('Cirrhotic,' 'Transition to cirrhosis,' 'Advanced fibrosis noncirrhotic,' 'Mild/minimal fibrosis,' and 'No fibrosis') were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using these five categories and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage ('Cirrhotic,' 'Transition to cirrhosis,' 'Advanced fibrosis noncirrhotic,' 'Mild/minimal fibrosis,' and 'No fibrosis') were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using these five categories and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage ('Cirrhotic,' 'Transition to cirrhosis,' 'Advanced fibrosis noncirrhotic,' 'Mild/minimal fibrosis,' and 'No fibrosis') were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using these five categories and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage (Stage F0, Stage F1, Stage F2, Stage F3, or Stage F4) were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by METAVIR Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage (Stage F0, Stage F1, Stage F2, Stage F3, or Stage F4) were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by METAVIR Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage (Stage F0, Stage F1, Stage F2, Stage F3, or Stage F4) were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by METAVIR Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver fibrosis stage (Stage F0, Stage F1, Stage F2, Stage F3, or Stage F4) were obtained from medical records. Liver fibrosis stage was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by METAVIR Liver Fibrosis Stage and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver elastography (FibroScan) were obtained from medical records. FibroScan values were based upon previous noninvasive assessment captured prior to treatment, if applicable. Mean FibroScan values were determined by averaging the values of all participants within each arm and expressed in kilopascals (kPa).

Measure: Mean FibroScan Values by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver elastography (FibroScan) were obtained from medical records. FibroScan values were based upon previous noninvasive assessment captured prior to treatment, if applicable. Mean FibroScan values were determined by averaging the values of all participants within each arm and expressed in kPa.

Measure: Mean FibroScan Values by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver elastography (FibroScan) were obtained from medical records. FibroScan values were based upon previous noninvasive assessment captured prior to treatment, if applicable. Mean FibroScan values were determined by averaging the values of all participants within each arm and expressed in kPa.

Measure: Mean FibroScan Values by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver elastography (FibroScan) were obtained from medical records. FibroScan values were based upon previous noninvasive assessment captured prior to treatment, if applicable. Mean FibroScan values were determined by averaging the values of all participants within each arm and expressed in kPa.

Measure: Mean FibroScan Values by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Secondary Outcomes

Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver inflammation grade (Grade A0, Grade A1, Grade A2, or Grade A3) were obtained from medical records. Liver inflammation grade was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by METAVIR Liver Inflammation Grade and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver inflammation grade (Grade A0, Grade A1, Grade A2, or Grade A3) were obtained from medical records. Liver inflammation grade was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs12979860 by METAVIR Liver Inflammation Grade and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver inflammation grade (Grade A0, Grade A1, Grade A2, or Grade A3) were obtained from medical records. Liver inflammation grade was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by METAVIR Liver Inflammation Grade and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and liver inflammation grade (Grade A0, Grade A1, Grade A2, or Grade A3) were obtained from medical records. Liver inflammation grade was based upon previous biopsy using the METAVIR scoring system and captured prior to treatment, if applicable.

Measure: Number of Participants With IL28B Genotype rs8099917 by METAVIR Liver Inflammation Grade and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including gender, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs12979860 by Gender: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including gender, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs12979860 by Gender: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including gender, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs8099917 by Gender: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including gender, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs8099917 by Gender: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including self-reported ethnic origin, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs12979860 by Ethnic Origin: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including self-reported ethnic origin, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs12979860 by Ethnic Origin: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including self-reported ethnic origin, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs8099917 by Ethnic Origin: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including self-reported ethnic origin, were obtained from medical records and/or participant interview at the Study Visit.

Measure: Number of Participants With IL28B Genotype rs8099917 by Ethnic Origin: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Mean body weight was calculated by averaging the values of all participants within each arm and expressed in kilograms (kg).

Measure: Mean Body Weight by IL28B Genotype rs12979860: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Mean body weight was calculated by averaging the values of all participants within each arm and expressed in kg.

Measure: Mean Body Weight by IL28B Genotype rs12979860: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Mean body weight was calculated by averaging the values of all participants within each arm and expressed in kg.

Measure: Mean Body Weight by IL28B Genotype rs8099917: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Mean body weight was calculated by averaging the values of all participants within each arm and expressed in kg.

Measure: Mean Body Weight by IL28B Genotype rs8099917: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including height and pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Each participant's BMI was calculated as weight divided by height-squared, expressed in kilograms per meter-squared (kg/m^2), and mean BMI was calculated by averaging the values of all participants within each arm.

Measure: Mean Body Mass Index (BMI) by IL28B Genotype rs12979860: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including height and pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Each participant's BMI was calculated as weight divided by height-squared, expressed in kg/m^2, and mean BMI was calculated by averaging the values of all participants within each arm.

Measure: BMI by IL28B Genotype rs12979860: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including height and pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Each participant's BMI was calculated as weight divided by height-squared, expressed in kg/m^2, and mean BMI was calculated by averaging the values of all participants within each arm.

Measure: BMI by IL28B Genotype rs8099917: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Demographic characteristics, including height and pre-treatment body weight, were obtained from medical records and/or participant interview at the Study Visit. Each participant's BMI was calculated as weight divided by height-squared, expressed in kg/m^2, and mean BMI was calculated by averaging the values of all participants within each arm.

Measure: BMI by IL28B Genotype rs8099917: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA level was obtained from medical records. Mean HCV RNA level was calculated by averaging the values of all participants within each arm and expressed in log10 international units per milliliter (log10 IU/mL).

Measure: Mean HCV RNA Level by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA level was obtained from medical records. Mean HCV RNA level was calculated by averaging the values of all participants within each arm and expressed in log10 IU/mL.

Measure: Mean HCV RNA Level by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA level was obtained from medical records. Mean HCV RNA level was calculated by averaging the values of all participants within each arm and expressed in log10 IU/mL.

Measure: Mean HCV RNA Level by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA level was obtained from medical records. Mean HCV RNA level was calculated by averaging the values of all participants within each arm and expressed in log10 IU/mL.

Measure: Mean HCV RNA Level by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. ALT level was obtained from medical records captured prior to treatment, if applicable. Each participant's ALT ratio was calculated as ALT level divided by the upper limit of normal (55 international units per liter [IU/L] for males and 30 IU/L for females). Mean ALT ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean Alanine Aminotransferase (ALT) Ratio by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. ALT level was obtained from medical records captured prior to treatment, if applicable. Each participant's ALT ratio was calculated as ALT level divided by the upper limit of normal (55 IU/L for males and 30 IU/L for females). Mean ALT ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean ALT Ratio by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. ALT level was obtained from medical records captured prior to treatment, if applicable. Each participant's ALT ratio was calculated as ALT level divided by the upper limit of normal (55 IU/L for males and 30 IU/L for females). Mean ALT ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean ALT Ratio by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. ALT level was obtained from medical records captured prior to treatment, if applicable. Each participant's ALT ratio was calculated as ALT level divided by the upper limit of normal (55 IU/L for males and 30 IU/L for females). Mean ALT ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean ALT Ratio by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. AST level was obtained from medical records captured prior to treatment, if applicable. Each participant's AST ratio was calculated as AST level divided by the upper limit of normal (40 IU/L for males and 25 IU/L for females). Mean AST ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean Aspartate Aminotransferase (AST) Ratio by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. AST level was obtained from medical records captured prior to treatment, if applicable. Each participant's AST ratio was calculated as AST level divided by the upper limit of normal (40 IU/L for males and 25 IU/L for females). Mean AST ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean AST Ratio by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. AST level was obtained from medical records captured prior to treatment, if applicable. Each participant's AST ratio was calculated as AST level divided by the upper limit of normal (40 IU/L for males and 25 IU/L for females). Mean AST ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean AST Ratio by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. AST level was obtained from medical records captured prior to treatment, if applicable. Each participant's AST ratio was calculated as AST level divided by the upper limit of normal (40 IU/L for males and 25 IU/L for females). Mean AST ratio was calculated by averaging the values of all participants within each arm.

Measure: Mean AST Ratio by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Platelet count was obtained from medical records captured prior to treatment, if applicable. Mean platelet count was calculated by averaging the values of all participants within each arm and expressed in 10^9 cells per liter (10^9 cells/L).

Measure: Mean Platelet Count by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Platelet count was obtained from medical records captured prior to treatment, if applicable. Mean platelet count was calculated by averaging the values of all participants within each arm and expressed in 10^9 cells/L.

Measure: Mean Platelet Count by IL28B Genotype rs12979860 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Platelet count was obtained from medical records captured prior to treatment, if applicable. Mean platelet count was calculated by averaging the values of all participants within each arm and expressed in 10^9 cells/L.

Measure: Mean Platelet Count by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. Platelet count was obtained from medical records captured prior to treatment, if applicable. Mean platelet count was calculated by averaging the values of all participants within each arm and expressed in 10^9 cells/L.

Measure: Mean Platelet Count by IL28B Genotype rs8099917 and HCV RNA Genotype: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Region: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Region: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Region: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Region: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Country: Treatment-Naive (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Country: Treatment-Naive (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Country: Treatment-Experienced (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs12979860 by HCV RNA Genotype and Country: Treatment-Experienced (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Country: Treatment-Naive (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Country: Treatment-Naive (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Country: Treatment-Experienced (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With IL28B Genotype rs8099917 by HCV RNA Genotype and Country: Treatment-Experienced (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype.

Measure: Number of Participants With IL28B Genotype rs12979860 by IL28B Genotype rs8099917 Category: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype.

Measure: Number of Participants With IL28B Genotype rs12979860 by IL28B Genotype rs8099917 Category: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype.

Measure: Number of Participants With Inosine Triphosphatase (ITPA) Genotype rs7270101 by ITPA Genotype rs1127354 Category: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype.

Measure: Number of Participants With ITPA Genotype rs7270101 by ITPA Genotype rs1127354 Category: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Region: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Region: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Region: Treatment-Naive

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and geographic region of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Region: Treatment-Experienced

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Country: Treatment-Naive (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Country: Treatment-Naive (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Country: Treatment-Experienced (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs1127354 by HCV RNA Genotype and Country: Treatment-Experienced (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Country: Treatment-Naive (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Country: Treatment-Naive (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Country: Treatment-Experienced (Table 1 of 2 [G1, G2, G3])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records, and country of study site was documented during intake/enrollment.

Measure: Number of Participants With ITPA Genotype rs7270101 by HCV RNA Genotype and Country: Treatment-Experienced (Table 2 of 2 [G4, Other, Total])

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Virological response types within the first 12 weeks of treatment included rapid virological response (RVR), complete early virological response (cEVR), and partial early virological response (pEVR). RVR was defined as an undetectable HCV RNA level within the first 4 weeks, cEVR as an undetectable level within the first 12 weeks, and pEVR as a 2-log drop from Baseline to 12 weeks. Undetectable viral loads include those below the lower limit of detection (LLOD) for the assay performed, which may vary from site to site. Response categories were mutually exclusive, meaning participants could only achieve cEVR/pEVR in the absence of RVR. Participants achieving neither RVR nor cEVR/pEVR were recorded as 'none of the above.'

Measure: Number of Participants With IL28B Genotype rs12979860 by Type of Virological Response in the First 12 Weeks of Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Virological response types within the first 12 weeks of treatment included RVR, cEVR, and pEVR. RVR was defined as an undetectable HCV RNA level within the first 4 weeks, cEVR as an undetectable level within the first 12 weeks, and pEVR as a 2-log drop from Baseline to 12 weeks. Undetectable viral loads include those below the LLOD for the assay performed, which may vary from site to site. Response categories were mutually exclusive, meaning participants could only achieve cEVR/pEVR in the absence of RVR. Participants achieving neither RVR nor cEVR/pEVR were recorded as 'none of the above.'

Measure: Number of Participants With IL28B Genotype rs8099917 by Type of Virological Response in the First 12 Weeks of Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Virological response types at the end of treatment included undetectable and detectable HCV RNA level. Undetectable viral loads include those below the LLOD for the assay performed, which may vary from site to site.

Measure: Number of Participants With IL28B Genotype rs12979860 by Type of Virological Response at End of Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Virological response types at the end of treatment included undetectable and detectable HCV RNA level. Undetectable viral loads include those below the LLOD for the assay performed, which may vary from site to site.

Measure: Number of Participants With IL28B Genotype rs8099917 by Type of Virological Response at End of Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Overall virological response types included sustained virological response (SVR), relapse, and breakthrough. SVR was defined as undetectable HCV RNA level at 24 weeks post-treatment, relapse as an undetectable level at end of treatment with a detectable level at the last post-treatment measurement, and breakthrough as an undetectable level at 1 or more treatment measurements with a detectable level at end of treatment. Undetectable viral loads include those below the LLOD for the assay performed, which may vary from site to site. Response categories were mutually exclusive. Participants with detectable HCV RNA level at 12 or more treatment measurements and who did not meet SVR criteria were considered nonresponders, and those with insufficient treatment response data were recorded as 'none of the above.'

Measure: Number of Participants With IL28B Genotype rs12979860 by Overall Virological Response Type and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine IL28B genotype. HCV RNA genotype and virological response to prior treatment were obtained from medical records. Overall virological response types included SVR, relapse, and breakthrough. SVR was defined as undetectable HCV RNA level at 24 weeks post-treatment, relapse as an undetectable level at end of treatment with a detectable level at the last post-treatment measurement, and breakthrough as an undetectable level at 1 or more treatment measurements with a detectable level at end of treatment. Undetectable viral loads include those below the LLOD for the assay performed, which may vary from site to site. Response categories were mutually exclusive. Participants with detectable HCV RNA level at 12 or more treatment measurements and who did not meet SVR criteria were considered nonresponders, and those with insufficient treatment response data were recorded as 'none of the above.'

Measure: Number of Participants With IL28B Genotype rs8099917 by Overall Virological Response Type and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype and hematology data were obtained from medical records. Participants with a history of a hemoglobin level less than 10 grams per deciliter (g/dL) or a drop of more than 3 g/dL at any time during prior treatment for CHC were recorded as 'yes' for this finding.

Measure: Number of Participants With ITPA Genotype rs1127354 by Incidence of Hemoglobin Drop During Prior Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype and hematology data were obtained from medical records. Participants with a history of a hemoglobin level less than 10 g/dL or a drop of more than 3 g/dL at any time during prior treatment for CHC were recorded as 'yes' for this finding.

Measure: Number of Participants With ITPA Genotype rs7270101 by Incidence of Hemoglobin Drop During Prior Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records. Past medication use was obtained from medical records and/or participant interview at the Study Visit. Participants with a history of erythropoietin use during prior treatment for CHC were recorded as 'yes' for this finding.

Measure: Number of Participants With ITPA Genotype rs1127354 by Erythropoietin Use During Prior Treatment and HCV RNA Genotype

Time: Study Visit 1

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Description: Participants underwent blood sampling at the Study Visit to determine ITPA genotype. HCV RNA genotype was obtained from medical records. Past medication use was obtained from medical records and/or participant interview at the Study Visit. Participants with a history of erythropoietin use during prior treatment for CHC were recorded as 'yes' for this finding.

Measure: Number of Participants With ITPA Genotype rs7270101 by Erythropoietin Use During Prior Treatment and HCV RNA Genotype

Time: Study Visit 1

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Primary Outcomes

Measure: Percentage of Participants With Sustained Viral Response (SVR) Defined as HBV DNA ≤ 2000 IU/ml at IL28B Genotype rs12979860 at End of Follow-up (EoF)

Time: EoF, as defined in the predecessor study, was at 48 weeks after the end of treatment.

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Measure: Percentage of Participants With SVR Defined as HBV DNA ≤ 2000 IU/ml at IL28B Genotype rs8099917 at EoF

Time: EoF

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Secondary Outcomes

Measure: Percentage of Participants With HBV DNA ≤ 2000 IU/ml at IL28B Genotype rs12979860 at End of Treatment (EoT)

Time: EoT, as defined in the predecessor study, was at Week 48 or Week 96

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Measure: Percentage of Participants With HBV DNA ≤ 2000 IU/ml at IL28B Genotype rs8099917 at EoT

Time: EoT

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Measure: Percentage of Participants With HBsAg < 0.05 IU/ml at IL28B Genotype rs12979860 at EoT and EoF

Time: EoT and EoF

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Measure: Percentage of Participants With HBsAg < 0.05 IU/ml at IL28B Genotype rs8099917 at EoT and EoF

Time: EoT and EoF

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Measure: Percentage of Participants With HBsAg ≤ 10 IU/ml at IL28B Genotype rs12979860 at EoT and EoF

Time: EoT and EoF

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Measure: Percentage of Participants With HBsAg ≤ 10 IU/ml at IL28B Genotype rs8099917 at EoT and EoF

Time: EoT and EoF

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Primary Outcomes

Description: Blood HCV RNA copies were assayed with Roche - COBAS® AmpliPrep/COBAS® TaqMan® HCV Test.

Measure: Absolute Blood HCV RNA Copies at designed time points

Time: 0hr,24hr,1wk,2wk,4wk,6wk,12wk,24wk,48wk,72wk

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Secondary Outcomes

Description: IL28 gene polymorphism,rs8099917,rs12979860,etc

Measure: IL-28B polymorphism

Time: Baseline

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Description: HCV NS5A is cloned into T vector and sequenced for evolutionary analysis.

Measure: HCV genotype

Time: Baseline

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Description: ALT AST are assayed to detect the hepatic function.

Measure: Alanine Aminotransferase (ALT) and Aspartate transaminase (AST)

Time: Baseline,4wk,12wk,24wk,48wk

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Description: Fibrosis is analyzed with Fibroscan.

Measure: Fibrosis stage

Time: Baseline,4wk,12wk,24wk,48wk

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Description: The distribution and absolute count of the different types of blood cells are assayed.

Measure: Regular blood test

Time: Baseline,4wk,12wk,24wk,48wk

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Description: Electrocardiography is taken to avoid severe side effects.

Measure: Electrocardiography

Time: Baseline,4wk,12wk,24wk,48wk

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Description: Patients are asked whether they take alcohol or smoke cigarettes during the therapy period.

Measure: Alcohol ,smoking condition

Time: Baseline,4wk,12wk,24wk,48wk

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Description: Patients will be asked about their drug usage history.

Measure: Drug abuse history

Time: Baseline

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Primary Outcomes

Measure: Change in pocket depth (mm)

Time: 21 days

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Measure: Change in clinical attachment level (mm)

Time: 21 days

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Measure: Change in plaque index (0-3)

Time: 21 days

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Measure: Change in bleeding on probing (Yes/No)

Time: 21 days

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Measure: Change in gingival crevicular fluid interleukin-1 beta (GCF IL-1b)

Time: 21 days

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Measure: Change in gingival crevicular fluid prostaglandin E2 (GCF PGE2)

Time: 21 days

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Measure: Change in gingival crevicular fluid interleukin-29 (GCF IL-29)

Time: 21 days

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Measure: Change in gingival crevicular fluid interleukin-28B (GCF IL-28B)

Time: 21 days

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Measure: Change in gingival index (0-4)

Time: 21 days

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Measure: Composition of the microbiota oral flora

Time: 21 days

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Measure: Change in gingival crevicular fluid interleukin-6 (GCF IL-6)

Time: 21 days

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Secondary Outcomes

Measure: Change in interleukin-29 expression in dendritic cells at day 35

Time: 35 days

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Measure: Change in interleukin-28B expression in dendritic cells at day 35

Time: 35 days

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Primary Outcomes

Measure: the prevalence of genetic variants for IL28B SNPs (rs 12979860 and rs 8099917) in HCV patients in Singapore.

Time: Baseline

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Secondary Outcomes

Measure: The distribution of the different SNP variants in different ethnic groups (Chinese, Malay, Indian and others)

Time: Baseline

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Description: To study the correlation between genetic variants and treatment response

Measure: The association of the genetic variants and the treatment response in patients receiving peg-interferon/ ribavirin therapy.

Time: Baseline

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