This clinical trial was designed to investigate the efficiency and toxicity of tomotherapy as primary radiotherapy for multiple brain metastases.

This is a single-arm, single center, phase II trial to investigate the feasibility and toxicity of tomotherapy as primary radiotherapy for multiple brain metastases(≥3 lesions).

Inclusion Criteria:Histologic or cytologic diagnosis of primary tumor and conformed brain metastases by enhanced MRI or CT; the lesion number is no less than 3;KPS ≥60,or KPS ≥40 and the limitation of motion is simply caused by brain tumor that is adjacent to the motor function areas; Age: 18-75 years old; Adequate organ function:WBC≥4.0x109/L, Neu ≥ 1.5x109/L, Hemoglobin ≥ 110 g/L, Platelets ≥100 x109/L, Totalbilirubin ≤ 1.5x ULN, AST and ALT ≤ 1.5x ULN, BUN and Cr: within the normal range.

Exclusion Criteria: Other clinically significant diseases (e.g.myocardial infarction within the past 6 months, severe arrhythmia). Unable or unwilling to comply with the study protocol.The expected survival time is less than 3 months. Patients who are anticipated in other clinical trials of brain metastases. Patients who has been treated with WBRT. Pregnant patients or female patients whose HCG is positive. Unsuitable to participate in study, that in the opinion of the treating physician.