Most patients had less than 16 lymph nodes removed accounting for 53.1%, tumor invasion is mainly T4a accounting for 59.3%, N1 lymph node metastasis was the highest with 35.9%, the most common stage of the disease is IIIA accounting for 42.2%, tumor ≥ T3 with lymph node metastasis accounts for 77.3%, adenocarcinoma accounted for the highest rate with 67.2%.