1. Department of Medical Oncology State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China
2. Research Unit of Precision Diagnosis and Treatment for Gastrointestinal Cancer Chinese Academy of Medical Sciences Guangzhou Guangdong 510060 P. R. China
3. Department of Clinical Research Sun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China