title: Lung cancer in patients under 50 years old.
abstract: OBJECTIVE
  The community based lung cancer registry was set up and the results were analysed to assess the differences in clinicopathological parameters and survival between patients under and over 50 years of age.
  
  
  METHODS
  The Pulmonary Outpatient Clinics supplied the data on 5404 lung cancer patients diagnosed in Poland in 1995. Data regarding demographic, smoking, histology, clinical stage, performance status, family history of cancer, therapy and survival were obtained.
  
  
  RESULTS
  At time of diagnosis 757 (14%) patients were under 50 years of age. In this group the frequency of females was higher as compared to this in the group of older patients (24.2% vs. 12.1%; P<0.001). Also the incidence of adenocarcinoma (12.6% vs. 7.6%; P<0.001) and small cell lung cancer (22.9% vs. 14.8%; P<0.001) were significantly higher in younger patients. Young patients had better performance status (55.4% vs. 46.6%; P<0.001) than old. The incidence of cancer in families of younger patients was higher both among the mothers (4.7% vs. 3.0%; P<0.001) and among the fathers (7.6% vs. 4.1%, P<0.001). Surgery or chemotherapy were more often applied to patients under 50 years in comparison to older ones (P<0.001). Young patients had better prognosis. Higher percentage of them survived one year (32.6% vs. 28.9%; P<0.049). In multivariate analysis, age over 50 at diagnosis, male gender, diagnosis of small cell lung cancer, advanced stage of the disease, bad performance status, and non-surgical therapy were independent negative prognostic factors.
  
  
  CONCLUSIONS
  Among young patients, overrepresentation of women, subjects with positive family history of cancer, with better performance status, with adenocarcinoma and small cell lung cancer were noticed. Young patients were treated more aggressively and had better prognosis than patients over 50 years of age.
authors.affiliation: III Department of Tuberculosis and Lung Diseases, National Tuberculosis and Chest Diseases Research Institute, Warsaw 01-138, Płocka 26 St., Poland. e.radzikowska@igichp.edu.pl
authors.forename: E
authors.initials: E
authors.lastname: Radzikowska
authors.forename: K
authors.initials: K
authors.lastname: Roszkowski
authors.forename: P
authors.initials: P
authors.lastname: Głaz
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology*; D017668:Age of Onset; D018288:Carcinoma, Small Cell / Q000453:epidemiology*; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011044:Poland / Q000453:epidemiology; D015995:Prevalence; D011379:Prognosis; D012307:Risk Factors; D017678:Sex Distribution; D016019:Survival Analysis