a. A scan to confirm the absence of brain metastases is not required. b. Patients with radiological evidence of stable brain metastases are eligible, providing that they are asymptomatic and: i. Do not require corticosteroids, or ii. Have previously been treated with corticosteroids, with clinical and radiological evidence of stabilisation at least 10 days after discontinuation of steroids iii. The patient can receive a stable dose of corticosteroids before and during the study as long as these were started at least 28 days prior to treatment.