IRSA - Stereotactic Radiosurgery for Patients with Metastatic Brain Cancer
http://www.irsa.org/metastatic%20guideline.pdf
[May 2008, the latest version I could find]
"Lesions of the brain and leptomeninges account for 80% of intracranial metastases. The majority of brain metastases (approximately 80%) are located in the cerebral hemispheres. The cerebellum (10–15%) and brainstem (2– 3%) are less frequently involved."
"Patients treated with conventional open surgical resection without WBRT had a 46% risk of failure at the site of the resection in a randomized trial evaluating the role of WBRT after surgical resection. In subsequent studies patients were treated with SRS alone (without WBRT). These studies found excellent local control (70–80% at one year). Other published series of patients treated with SRS have demonstrated a risk of distant brain failure at one year, ranging from 43% to 57%. In general, the risk of new metastasis in patients with solitary tumors is approximately 37% (crude), but the actuarial risk is 50% at one year"