Lung cancer within 1 cm is considered stage I lung cancer. Therefore, tumors within 1 cm of lung cancer can be surgically removed as much as possible, which can lead to longer recurrence-free survival or progression-free survival time after surgery, with 5-year survival rate of over 90%, or even long-term survival without recurrence. Of course, 1 cm tumor can be detected mainly through regular physical examination, such as low-dose lung CT plain scan, because tumors within 1 cm often have no obvious symptoms, such as coughing, coughing sputum, sputum blood, etc.