title: Cytochrome P450-isoenzyme 1A1 in susceptibility to tobacco-related lung cancer.
abstract: BACKGROUND
  Tobacco smoke contains many carcinogens that may mediate susceptibility to lung cancer. Cytochrome P450 isoenzyme 1A1 activity and expression increases several fold in lung cancer due to smoking. Finding the role of cytochrome P450 1A1 in susceptibility to tobacco-related lung cancer may be important to predict the outcome in early stage cancer, and may result in an improved survival rate.
  
  
  METHODS
  This study was carried on 2 groups of patients: group A was 20 patients with operable smoking-related lung cancer, who underwent surgery at the time of diagnosis; group B was 20 nonsmokers without lung cancer who underwent chest exploration following road traffic accidents. Specimens were obtained from tumor tissue and surrounding healthy tissue in group A patients, and from healthy lung tissue in group B patients. These specimens were sent for measurement of protein content and cytochrome P450 1A1 activity.
  
  
  RESULTS
  There was significantly greater tissue cytochrome P450 1A1 activity in group A compared to group B. Patients with stage II cancer showed significantly higher levels of tissue cytochrome P450 1A1 activity than those with stage I. There was also a significant difference in tissue cytochrome P450 1A1 activity between the tumor tissue and the tissue surrounding the tumor.
  
  
  CONCLUSIONS
  Carcinogens in smoke increase cytochrome P450 1A1 activity, which might be considered to play a role in cigarette smoking-induced lung cancer.
authors.affiliation: Cardiothoracic Surgery Department, Zagazig University, Egypt.
authors.forename: Nabil
authors.initials: N
authors.lastname: El Sadeck
authors.forename: Bedir M
authors.initials: BM
authors.lastname: Ibrahim
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Alassal
mesh_terms: D000328:Adult; D000368:Aged; D002283:Carcinoma, Bronchogenic / Q000201:enzymology / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis*; D004198:Disease Susceptibility; D004790:Enzyme Induction; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000201:enzymology / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011013:Pneumonectomy; D018570:Risk Assessment; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects* / Q000378:metabolism
chemical_list: C569463:CYP1A1 protein, human; D019363:Cytochrome P-450 CYP1A1
keywords: Cytochrome P-450 enzyme system; genetic predisposition to disease; lung neoplasms; smoking