A: For completely resected stage I patients, including for stage IA patients, there is no evidence that postoperative adjuvant chemotherapy can prolong the survival of patients. Therefore, generally adjuvant chemotherapy is not done in this stage. For patients with stage IB, adjuvant chemotherapy can be done or not. If there are high-risk factors, such as tumor of four centimeters or more, cancer residue in the cut edge, or cancer embolism in small vessels/lymphatic vessels, chemotherapy can be considered. For stage II and some stage III patients who can be completely resected, postoperative therapy can prolong the survival of patients, and there is no doubt that postoperative adjuvant chemotherapy should be done.