- Phase I: (closed to accrual 3/7/2001) Patients receive a single oral dose of acetaminophen, then acetylcysteine IV over 20 hours, beginning 6-8 hours after the acetaminophen. This treatment is repeated 3 weeks later. On day 1 of the first treatment, patients also receive carmustine IV over 1 hour, before the acetylcysteine. Courses repeat every 6 weeks in the absence of disease progression or unacceptable toxicity.