This study will compare the efficacy and safety of 2 different durations of treatment with pegylated interferon (PEG-IFN) alfa-2a in participants with Hepatitis B e Antigen (HBeAg)-negative chronic hepatitis B virus (HBV). It will also compare PEG-IFN alfa 2a treatment alone and in combination with lamivudine (LAM). The anticipated time on study treatment is 1-2 years, and the target sample size is 100-500 individuals.