title: Lung cancer: a persistent challenge.
abstract: The most frequently diagnosed type of lung cancer now is probably adenocarcinoma. This cell type is not clearly related to smoking, but may reflect environmental and occupational factors. Staging systems assess the extent of primary and metastatic disease, aid in determining appropriate treatment, and suggest prognosis. Clinical stage correlates with survival rate, but most staging systems underestimate the extent of metastases in lung cancer.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis* / Q000473:pathology; D000328:Adult; D000368:Aged; D001984:Bronchial Neoplasms / Q000175:diagnosis* / Q000532:radiotherapy / Q000601:surgery; D002277:Carcinoma / Q000175:diagnosis* / Q000473:pathology; D018288:Carcinoma, Small Cell / Q000175:diagnosis* / Q000473:pathology; D004724:Endoscopy; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000000981:diagnostic imaging; D009367:Neoplasm Staging; D011877:Radionuclide Imaging; D012306:Risk; D012907:Smoking; D014057:Tomography, X-Ray Computed