Pooled analysis of mitochondrial DNA copy number and lung cancer risk in three prospective studies

Christopher Kim, Bryan A. Bassig, Wei Jie Seow, Wei Hu, Mark P. Purdue, Xiao Ou Shu, Wen Yi Huang, Chin San Liu, Wen Ling Cheng, Ta Tsung Lin, Yong Bing Xiang, Bu Tian Ji, Yu Tang Gao, Wong Ho Chow, Satu Männistö, Stephanie J. Weinstein, Demetrius Albanes, Wei Zheng, H. Dean Hosgood, Unhee LimNathaniel Rothman, Qing Lan

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Results: Overall, mtDNA CN was not associated with lung cancer risk in the PLCO, SWHS, or pooled populations (all P trends > 0.42, P heterogeneity = 0.0001), and mtDNA CN was inversely associated with lung cancer risk among male smokers in PLCO, the opposite direction observed in ATBC. In addition, the mtDNA CN association observed among male heavy smokers in ATBC was the opposite direction in PLCO.

Conclusions: mtDNA CN was not consistently associated with lung cancer risk across three prospective study populations from Europe, Asia, and the United States.

Impact: This pooled study suggests no consistent association between prediagnostic mtDNA CN levels and lung cancer risk across several populations.

Background: We previously reported that higher levels of mitochondrial DNA copy number (mtDNA CN) were associated with lung cancer risk among male heavy smokers (i.e., ≥20 cigarettes per day) in the Alpha-Tocopherol Beta-Carotene (ATBC) study. Here, we present two additional prospective investigations nested in the Prostate, Lung, Colorectal, and Ovarian (PLCO) cancer screening trial and the Shanghai Women's Health Study (SWHS), and pooled with previously published data from ATBC.

Materials: All DNA were extracted from peripheral whole blood samples using the phenol-chloroform method, and mtDNA CN was assayed by fluorescence-based qPCR. Multivariate unconditional logistic regression models were used to estimate ORs and 95% confidence intervals for the association of mtDNA CN and lung cancer risk.

Original languageEnglish (US)
Pages (from-to)2977-2980
Number of pages4
JournalCancer Epidemiology Biomarkers and Prevention
Issue number12
StatePublished - Dec 1 2014

ASJC Scopus subject areas

  • Epidemiology
  • Oncology


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