1. Department of Medical OncologyState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineSun Yat‐sen University Cancer Center Guangzhou Guangdong 510060 P. R. China
2. Shanghai Junshi Biosciences Company Limited Shanghai 201203 P. R. China
3. Precision Diagnosis and Treatment for Gastrointestinal CancerChinese Academy of Medical Sciences Guangzhou Guangdong 510060 P. R. China