A. The 5-year overall survival (OS) rates were compared between the VATS and thoracotomy groups for clinical stage IA NSCLC. In the VATS group, the OS rate was 94.1%, while in the thoracotomy group, it was 81.8% (p = 0.0268). For pathological stage IA NSCLC, the VATS group had an OS rate of 94.8%, and the thoracotomy group had a rate of 96.2% (p = 0.5545). This study was conducted on May 17, 2014.