Follow-up of lung cancer: The examination methods include medical history, physical examination, hematological examination, imaging examination, endoscopy, etc. The aim is to monitor disease recurrence or treatment-related adverse effects and assess the quality of life. The frequency of follow-up is every 3 to 6 months within 2 years after treatment, every 6 months within 2 to 5 years, and every year after 5 years. Follow-up of esophageal cancer: For asymptomatic patients with esophageal cancer, follow-up is once every 4 months in the first year, once every 6 months in the second to third years, and once a year thereafter; follow-up includes medical history and physical examination, and whether routine blood, blood biochemistry, endoscopy and imaging are performed according to clinical conditions.