OUTLINE: Patients are given oral perillyl alcohol 4 times per day. Dose escalation of perillyl alcohol may occur in individual patients if no unacceptable toxicity is observed. Treatment is continued as long as the patient benefits from treatment, does not show progressive disease, and does not experience irreversible or life threatening toxicity. Patients are evaluated for response monthly while receiving treatment on this study. Patients are followed at 2-4 weeks after the last treatment.