Department of Gastrointestinal Surgery University Cancer Hospital&Institute 100142;
Gastro-intestinal Ward III Cancer Hospital 100142;
Department of Pathology Laboratory of Carcinogenesis and Translational Research(Ministry of Education) University Cancer Hospital&Institute 100142;
Department of Radiology University Cancer Hospital&Institute 100142;
Department of Nuclear Medicine University Cancer Hospital&Institute 100142;
PREOPERATIVE; PD-1 blockade; dMMR/MSI-H; Gastrointestinal malignancies;