title: [Cyfra 21-1--a new tumor marker of the cytokeratin series in differential diagnosis of lung diseases].
abstract: BACKGROUND
  Cyfra 21-1 is a novel marker for non small cell lung cancer. Up to now only few data about the value of Cyfra 21-1 in the diagnosis of malignant and non-malignant pulmonary diseases are available. Further the effect of long-time cigarette consumption on serum concentrations of Cyfra 21-1 has not been described. Aim of this study therefore was the determination of Cyfra 21-1 in different malignant and non-malignant pulmonary diseases and in healthy smokers and nonsmokers.
  
  
  METHODS
  Sera of healthy individuals (control group, n = 121; 63 smokers and 58 nonsmokers), patients with chronic bronchitis (n = 50), lung fibrosis (n = 38), exogen allergic alveolitis (n = 32), lung tuberculosis (n = 45), sarcoidosis (n = 30), small cell lung cancer (n = 60), squamous cell carcinoma (n = 53), non-small cell carcinoma (n = 29) and adenocarcinoma (n = 52) were analyzed.
  
  
  RESULTS
  Within the control group no significant differences of the Cyfra 21-1 serum concentration were observed between smokers and nonsmokers. Serum concentrations of Cyfra 21-1 were similar in the control group, patients with non-malignant pulmonary diseases and patients with small cell lung cancer whereas serum concentrations were significantly increased in patients with non-small cell lung cancer, adenocarcinoma and squamous cell carcinoma.
  
  
  CONCLUSIONS
  The data confirm the high sensitivity and specific of Cyfra 21-1 for the differential diagnosis between malignant and non-malignant pulmonary diseases as well as small cell and non-small cell lung cancer.
authors.affiliation: Zentrallabor des Zentrums für Innere Medizin, Frankfurt/Main.
authors.forename: G M
authors.initials: GM
authors.lastname: Oremek
authors.forename: U B
authors.initials: UB
authors.lastname: Seiffert
authors.forename: R
authors.initials: R
authors.lastname: Siekmeier
authors.forename: R
authors.initials: R
authors.lastname: Kirsten
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000097:blood* / Q000145:classification; D002289:Carcinoma, Non-Small-Cell Lung / Q000097:blood / Q000175:diagnosis; D018288:Carcinoma, Small Cell / Q000097:blood / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007633:Keratins / Q000097:blood* / Q000145:classification; D008171:Lung Diseases / Q000097:blood / Q000175:diagnosis*; D008175:Lung Neoplasms / Q000097:blood / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012016:Reference Values; D012907:Smoking / Q000009:adverse effects* / Q000097:blood
chemical_list: D014408:Biomarkers, Tumor; D007633:Keratins