Phase II study of dose escalation and concentration in stereotactic body radiotherapy (SBRT) for metastatic pulmonary or liver tumors from colorectal cancer

Interventions: stereotactic body radiation therapy 50-60Gy/5fr(60% isodose)/5-12days Primary outcome(s): 2-year local control of pulmonary and liver metastasis from colorectal cancer Study Design: Single arm Non-randomized