OUTLINE: This is a dose escalation, open label, multicenter study. Patients receive pegylated-interferon alfa-2a (PEG-IFN) subcutaneously once a week for 24 weeks. Dose escalation of PEG-IFN continues until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 6 patients experience dose limiting toxicity. After the MTD of PEG-IFN is determined, additional patients are treated at this dose level. These patients may continue treatment after the first 24 weeks for up to 1 year, in the absence of disease progression. Patients are followed for 4 weeks.