Inclusion Criteria:

- Patients must have a histologically confirmed diagnosis of intracranial glioblastoma
multiforme (GBM) or gliosarcoma (GS).

- Biopsy or resection must have been performed no more than 5 weeks prior to treatment.

- An MRI or CT scan must be obtained within 14 days prior to treatment.

- Patients must not have received prior drug therapy for brain tumors.

- Patients must have adequate organ function demonstrated by lab tests within 14 days
prior to treatment.

Exclusion Criteria:

- Patients will be excluded if unable to swallow tablets.

- Patients will be excluded if unable to discontinue use of enzyme inducing
antiepileptic drugs or have been off of these agents less than 2 weeks prior to
treatment (i.e. phenytoin (Dilantin), carbamazepine, etc.).

- Patients will be excluded if have active infection.

- Patients will be excluded if have a significant medical illness that, in the
investigator's opinion, cannot be adequately controlled with appropriate therapy or
would compromise the patient's ability to tolerate this therapy.

- Patients will be excluded if they have concurrent therapy with an anticoagulant. If
the patient requires anticoagulant therapy after starting treatment, the patient may
remain on study but should be monitored carefully.