title: A family history of cancer and lung cancer risk in never-smokers: A clinic-based case-control study.
abstract: OBJECTIVE
  Some population-based studies involving lung cancer patients have reported that inherited susceptibility is responsible for the familial aggregation observed in non-smoking lung cancer patients; however, it has been found that the false-negative rates in clinic-ascertained probands are significantly lower than population-ascertained probands. In this clinic-based study, we sought to determine the relationship between a family history of cancer and lung cancer risk in Chinese never-smokers.
  
  
  METHODS
  In this clinic-based case-control study, all 318 probands and 509 controls were Chinese. The data on demographic characteristics, age, gender, race, lung disease history, living environment, occupational exposure, and smoking history were collected from a structured questionnaire. Multiple conditional logistic regression was used to estimate adjusted odds ratios (aOR) and 95% CIs after adjusting for possible confounders.
  
  
  RESULTS
  The risk of lung cancer was increased in individuals with a family history of lung (aOR, 3.21; p<0.001) or any other cancer (aOR, 1.79; p<0.001). Analyses were carried out using stratified relative gender; first-degree female relatives tended to have a higher risk than first-degree male relatives. Similarly, the aOR for a female developing a malignant tumor was two times greater than controls.
  
  
  CONCLUSIONS
  Our analysis provides further evidence of the importance of genetic factors underlying lung cancer in patients who are never-smokers, especially in patients with a maternal history of cancer.
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Lin
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Yi-Sheng
authors.initials: YS
authors.lastname: Huang
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Hong-hong
authors.initials: HH
authors.lastname: Yan
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Xue-Ning
authors.initials: XN
authors.lastname: Yang
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Wen-Zhao
authors.initials: WZ
authors.lastname: Zhong
authors.affiliation: Guangdong Province Traditional Chinese Medical Hospital, Guangzhou 510000, China.
authors.forename: Huan-Wen
authors.initials: HW
authors.lastname: Ye
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Jin-Ji
authors.initials: JJ
authors.lastname: Yang
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510080, China. Electronic address: syylwu@live.cn.
authors.forename: Yi-Long
authors.initials: YL
authors.lastname: Wu
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D015897:Comorbidity; D005190:Family; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure / Q000009:adverse effects; D011159:Population Surveillance; D012306:Risk; D012907:Smoking; D012924:Social Conditions
keywords: Adenocarcinoma; Epidermal growth factor receptor; Familial aggregation; Genetics; Lung cancer; Never-smoker