Department of Medical Oncology;
the Sixth Affiliated Hospital;
Sun Yat-sen University;
Guangzhou;
Guangdong 510655;
P. R. China;
Department of Medical Oncology;
Sun Yat-sen University Cancer Center;
Guangzhou;
Guangdong 510060;
P. R China;
Department of Colorectal Surgery;
the Sixth Affiliated Hospital;
Sun Yat-sen University;
Guangzhou;
Guangdong 510655;
P. R. China;
Seattle Cancer Care Alliance;
Seattle;
Washington 98115;
USA;