（3）显微镜下检查：对所有切片进行显微镜下观察、描述和病理组织学诊断，

(3) Microscopic examination: perform microscopic observation, description and histopathological diagnosis on all slices, determine the histological type and histological grade of the tumor, determine whether there is blood vessel and / or nerve infiltration, record the number of positive lymph nodes, and measure The largest diameter of the largest positive lymph node and the largest diameter of the largest negative lymph node. <br>(4) TNM staging and lymph node index: According to the "Standardized Diagnostic Criteria for Tumor Pathology" (CACA Tumor Pathology Professional Committee), combined with clinical data and microscopic examination results, all cases were TNM staging. At the same time, the lymph node index of each sample was calculated according to the definition of the lymph node index.

(3) Under-microscope examination: all slices under the microscope observation, description and pathological histology diagnosis, determine the tumor histology type, histological classification, determine whether there are blood vessels and / or nerve immersion, record the number of positive lymph nodes, measure the maximum diameter of the largest positive lymphatic and the maximum maximum diameter of the largest negative lymphnodes.<br>(4) TNM staging and lymph node index: TNM staging for all cases in accordance with the Standardized Diagnostic Standardford Oncology Pathology (CACA Cancer Pathology Professional Committee) combined with clinical data and under-microscope examination results. At the same time, the lymph node index for each sample was calculated according to the definition of lymph node index.

(3) Microscopic examination: all sections were observed and described under microscope, and histopathological diagnosis was made to determine the histological type and histological grade of the tumor, to judge whether there was vascular and / or nerve infiltration, to record the number of positive lymph nodes, to measure the maximum diameter of the largest positive lymph nodes and the maximum diameter of the largest negative lymph nodes.<br>(4) TNM stage and lymph node index: according to the diagnostic standard of tumor pathology Standardization (CACA tumor pathology Professional Committee), combined with clinical data and microscopic examination results, TNM stage was carried out in all cases. At the same time, the lymph node index of each sample was calculated according to the definition of lymph node index.<br>