The purpose of this study is to evaluate whether the long-term outcome and safety of wedge resection are comparable to segmentectomy for the surgical treatment of early stage (IA) non-small cell lung cancer (NSCLC). Zhang et al. performed a meta-analysis of 53 studies and suggested that sublobectomy achieved a survival rate comparable to lobectomy in a selected population of patients with Stage I NSCLC. However, one critical question needs to be addressed, that is, does sublobectomy require segmentectomy or wedge resection? Cho et al. reported that, for pulmonary ground glass opacity (GGO) nodules (Stage IA NSCLC), wedge resection achieved a 5-year survival rate of 98.6% in the pure GGO group and 95.5% in the mixed GGO group. Cho et al. cautioned against performing wedge resection for mixed GGO nodules with GGO component ≤ 75%, due to the high recurrence rate. When radiology shows that the GGO component is ≥75%, pathology usually finds that the lesions are non-invasive. Therefore, these lesions are potential candidates for wedge resection. This randomized clinical trial is to assess whether wedge resection can be established as a standard treatment for Stage IA NSCLC with tumor size ≤ 2 cm and GGO component ≥ 75%.