早期肺癌患者约1/3无症状,尤其是周围型肺癌。在因症就诊发现的肺癌病人中,大多数属中晚期。有手术指征者不到1/4。晚期肺癌患者的五年生存率仅5.9％。而早期肺癌能作手术治疗者可达50％或更高。因此,借助普查检出无症状的临床前肺癌是早期诊断的重要一环。 About 1/3 of patients with early-stage lung cancer are asymptomatic, especially peripheral lung cancer. Most of the lung cancer patients found in the cause of illness are in the middle and late stages. There are less than a quarter of those who have surgical indications. The five-year survival rate of patients with advanced lung cancer is only 5.9%. Early stage lung cancer can be treated with up to 50% or more. Therefore, the detection of asymptomatic preclinical lung cancer by means of census is an important part of early diagnosis.