| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Patients with chronic HBeAg-negative hepatitis B with a stable oral antiviral treatment (not containing telbivudine) and a fully suppressed viral load for at least 12 months (below limit of detection in conventional HBV-PCR assays, i.e. <116 IU / ml).  | 
 
 
 | 
| E.1.1.1 | Medical condition in easily understood language  | 
| Patients with chronic hepatitis B. | 
 
 
 | 
| E.1.1.2 | Therapeutic area  | Diseases [C] - Virus Diseases [C02] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10019738 | 
 
| E.1.2 | Term  | Hepatitis B positive | 
 
| E.1.2 | System Organ Class  |  100000109834 | 
 
 
 | 
| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
| The primary objective of the trial is to investigate whether the add-on of pegylated interferon alfa-2a to a continued treatment with nucleos(t)ide analogues increases the percentage of patients who have significant decrease (≥1log10) of HBs-antigen after 48 weeks. | 
 
 
 | 
| E.2.2 | Secondary objectives of the trial  | 
• To evaluate safety and tolerability of pegylated interferon alfa-2a when combined with tenofovir, entecavir, lamivudine, adefovir, or a combination of those:
 - Adverse events
 - Vital signs, physical examination
 - Laboratory test abnormalities
 - Laboratory test value changes over time
 •To identify biological variables predicting HBs antigen decrease: 
 - viral genotype
 - kinetic of HBs antigen level 
 • To determine the effect of pegylated interferon on frequency and functional properties of HBV-specific cytotoxic and regulatory T-cells in responder and nonresponder patients 
 
 | 
 
 
 | 
| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
• Chronic hepatitis B, HBe antigen negative 
 • Treatment with a stable oral antiviral treatment (not containing telbivudine) and a fully suppressed viral load for at least 12 months (below limit of detection in conventional HBV-PCR assays, i.e. <116 IU / ml). 
 • 18-70 yrs
 • Willingness and ability to give informed consent and to follow study procedures
 • willingness to use adequate contraception
 
 | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
• HBe antigen positive Hepatitis B
 • Co-infection with HCV, HDV or HIV – as based on positive serology or PCR
 • Ongoing antiviral treatment with Telbivudine
 • Contraindications against treatment with pegylated interferon, e.g. severe depression, epilepsy, autoimmune diseases, pregnancy, leukocytopenia or thrombocytopenia at screening, etc. 
 • Preexisting polyneuropathy
 
 | 
 
 
 | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The primary endpoint is the objective response after 48 weeks of  therapy. The response is defined as a confirmed reduction of ≥1log10 in HBs antigen compared to baseline. | 
 
 
 | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.5.2 | Secondary end point(s) | 
1. Decline of quantitative HBs antigen at week 12 and 24
 2. Rate of patients with at least 10% HBs antigen loss at week 24 compared to baseline 
 3.HBsAg seroconversion defined as percentage of subjects who become HBsAg negative and anti-HBs positive during the observation period
 4.Safety and tolerability of pegylated interferon alfa-2a when added to a continuing treatment with tenofovir, entecavir, lamivudine, adefovir, or a combination of those:  Analysis of adverse events and laboratory data.
 
 | 
 
 
 | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
add 1. at week 12 and 24 
 add 2. at week 24
 add 3. at week 1 - 72
 add 4. at week 1 - 72
 
 
 | 
 
 
 | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  Yes  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  No  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  No  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  Yes  | 
| E.6.13.1 | Other scope of the trial description | 
- Immune monitoring
 - Bioinformatic analysis of genetic markers
 - Other biomarkers | 
 
 
 | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  Yes  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  No  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  Yes  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  No  | 
| E.8.1.5 | Parallel group |  Yes  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  No  | 
| E.8.2.3 | Other |  Yes  | 
| E.8.2.3.1 | Comparator description | 
| Patients of the controll group continue their basic Nucleos(t)ide treatment | 
 
 
 | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 16 | 
| E.8.5 | The trial involves multiple Member States |  No  | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  No  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.7 | Trial has a data monitoring committee |  No  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
 | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 0 | 
| E.8.9.1 | In the Member State concerned months | 24 | 
| E.8.9.1 | In the Member State concerned days | 0 |