OUTLINE: This is a multicenter study. Patients receive oral temozolomide daily on days 1-7 and 15-21. Treatment continues every 4 weeks for a maximum of 6 months in the absence of disease progression or unacceptable toxicity. Quality of life is assessed at baseline, every 4 weeks during study, and then every 8 weeks after study. Patients are followed for 1 month and then every 8 weeks thereafter.