PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 70%-100% Hematopoietic: Hematologic parameters normal Hepatic: Hepatic parameters normal (less than twice normal if on anticonvulsants) Renal: Renal parameters normal Cardiovascular: No congestive heart failure No angina Other: No medical contraindication to neurosurgery and fluid injection into brain No serious uncontrolled infection Negative pregnancy test required of fertile women prior to entry Adequate contraception required of fertile women during and for 3 months after treatment