Patients are randomized to receive methotrexate at Dose 1 or 2 (low doses) for 12 weeks, with 8 weeks of follow-up. If interim safety monitoring and viral burden results for the two cohorts support continuation, a third cohort of patients receive methotrexate starting at Dose 2 for the first 2 weeks, then at Dose 3 for the next 2 weeks, and at Dose 4 for the remaining 8 weeks, with 8 weeks of follow-up.