Cluster 610: brain metastases stable treated asymptomatic patients weeks treatment eligible steroids 
Cluster 1269: meningeal brain tumors metastatic symptomatic asymptomatic leptomeningeal allowed definitive treated 
Cluster 1579: metastasis brain known parenchymal patients bony subjects history active treated 
Cluster 1886: metastasis brain patients radiation treated steroids untreated active asymptomatic stable