一、文献类型
治疗与预后.
二、证据水平
1b.
三、文献来源
Alan DC, Richard S, Laurence E. Surgical resection of pri-mary tumors in patients who present with stageⅣ colorectal can-cer: An analysis of Surveillance, Epidemiolgy, and End Rcsults data, 1988 to 2000[J]. Ann Stag Oncol, 2005, 12(8): 637-645.