The study of human microorganism has become an important field, more evidences prove that it plays a key role in the occurrence and development of tumor.Normal respiratory microbes maintain a dynamic balance, further studies on microbial changes of respiratory diseases may provide a richer theoretical basis and more abundant evidence for etiology, pathogenesis, treatment and prognosis of lung cancer.This paper reviews the possible relationship of the microenvironment of respiratory system and specific microorganisms with the development of lung cancer.

Respiratory tract; Microecology; Microorganism; Lung cancer