5. Patients with untreated or symptomatic brain metastases. Patients with treated, asymptomatic brain metastases are eligible if there has been no change in brain disease status for at least 4 weeks before starting trial medication, no history of cerebral oedema or bleeding in the past 4 weeks before starting trial medication and must be on a stable or reducing dose of dexamethasone. Anti-epileptic therapy will be allowed if the patient is stable on antiepileptic treatment for 4 weeks, or more, without adjustments before starting trial medication.