The goal of this observational study is to learn about the effects of coronavirus infection in patients with early-stage lung cancer. The main question it aims to answer is whether the interval of surgery and COVID-19 infection will affect the surgery and prognosis of the patients.

Inclusion Criteria:

• Clinically diagnosed stage I and stage II lung cancer, who are about to receive wedge resection, segmental resection, sleeve resection, lobectomy, or pneumonectomy under general anaesthesia.
• Volunteer to participate in the study with good compliance. Able to complete the observation and follow-up and have signed the informed consent.
• ASA score: I-III;
• Cardiopulmonary functions meet the requirements of radical operation for lung cancer with normal liver and kidney functions.

Exclusion Criteria:

• Neurologic, mental illness or mental disorder which is hard to control, poor compliance, unable to cooperate or describe the treatment response;
• Clinically diagnosed stage III and stage IV lung cancer or patients who received neoadjuvant treatment before surgery;
• Patients developed symptoms alike coronavirus infection but are not confirmed by viral RNA detection by quantitative RT-PCR or antigen testing kits.
• Serious heart, lung, liver and kidney dysfunction and unable to tolerate the operation

Patients with clinically diagnosed stage I or stage II lung cancer who are about to receive radical surgery.