Patient: Pathological diagnosis: adenocarcinoma (of the lower lobe of the right lung). Tumor size 1.5X1.5X1 cm, moderately differentiated, invading the net of vascular bronchial dissection. The lymph nodes were examined for reactive hyperplasia (group 2 0/1, group 3 0/5, group 4 0/3, group 7 0/1, group 9 0/1, group 11 0/2, group 12 0/1, group 11 middle lobe 0/1. What is the best treatment? If I do chemotherapy, when is the best time for me to do chemotherapy? Doctor: According to the pathology report provided, if there is no evidence of distant metastasis in preoperative brain MRI, bone scan and other systemic examinations, and the tumor does not invade the dirty pleura in microscopic examination, then according to the seventh edition of the international TNM staging criteria for lung cancer, the patient is initially judged to belong to stage T1aNOM0 IA, a middle differentiated adenocarcinoma in the lower lobe of the right lung, and at present, patients with stage Ia lung cancer do not need conventional radiotherapy and chemotherapy after surgery. There is no evidence-based medical evidence at home and abroad that postoperative chemotherapy is required for stage IA patients. Regular postoperative review is recommended.