A Trial of Postoperative Whole Brain Radiation Therapy vs. Salvage Stereotactic Radiosurgery Therapy for Metastasis

Inclusion Criteria: 1. one to four brain metastases with a maximum diameter of 3 cm or more for the largest lesion and additional lesions not exceeding 3 cm in diameter 2. all brain metastases localized within cerebrum or cerebellum 3. before surgical resection for brain metastasis, PS is 0-2, or 3 by cerebral nerve compression neurological deficits 4. surgical resection for the largest brain metastases has achieved 5. after surgical resection, four or fewer (0-4) residual lesions with maximum diameter under 3 cm 6. histologically proven non-small cell carcinoma, breast cancer or colorectal cancer 7. primary lesion and the other metastases (i.e. lung, liver, bone metastases except for brain) is consider to be controlled 8. an age of 20-79 years 9. no prior surgery or irradiation for brain 10. adequate organ function 11. written informed consent(If signing in consent form is difficult for the patient due to paralysis, signing by the family in place of the patient is permitted) Exclusion Criteria: 1. synchronous or metachronous (within 5 years) malignancy other than carcinoma in situ or mucosal cancer 2. pregnant or breast-feeding women 3. severe mental disease 4. allergic to gadolinium contained contrast agents