1. State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Department of Oncology Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China
2. Department of Molecular Diagnosis Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China
3. Department of Experimental Research Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China
4. Department of Colorectal Surgery Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China