期刊
CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION
卷 24, 期 8, 页码 1239-1246出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1055-9965.EPI-14-1381
关键词
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资金
- Endowed Chair in Addictions
- NIH PGRN grant [DA020830]
- CAMH
- Canada Foundation for Innovation [20289, 16014]
- CAMH Foundation
- Ontario Ministry of Research and Innovation
- NIH TCORS grants [1P50DA036151]
- NIH grant from the National Institute On Drug Abuse [DA012393]
- NATIONAL INSTITUTE ON DRUG ABUSE [P50DA036151, P30DA012393, ZIADA000413, U01DA020830] Funding Source: NIH RePORTER
Background: The highly genetically variable enzyme CYP2A6 metabolizes nicotine to cotinine (COT) and COT to trans-3'-hydroxycotinine (3HC). The nicotine metabolite ratio (NMR, 3HC/COT) is commonly used as a biomarker of CYP2A6 enzymatic activity, rate of nicotine metabolism, and total nicotine clearance; NMR is associated with numerous smoking phenotypes, including smoking cessation. Our objective was to investigate the impact of different measurement methods, at different sites, on plasma and urinary NMR measures from ad libitum smokers. Methods: Plasma (n = 35) and urine (n = 35) samples were sent to eight different laboratories, which used similar and different methods of COT and 3HC measurements to derive the NMR. We used Bland-Altman analysis to assess agreement, and Pearson correlations to evaluate associations, between NMR measured by different methods. Results: Measures of plasma NMR were in strong agreement between methods according to Bland-Altman analysis (ratios, 0.82-1.16) and were highly correlated (all Pearson r > 0.96, P < 0.0001). Measures of urinary NMR were in relatively weaker agreement (ratios 0.62-1.71) and less strongly correlated (Pearson r values of 0.66-0.98, P < 0.0001) between different methods. Plasma and urinary COT and 3HC concentrations, while weaker than NMR, also showed good agreement in plasma, which was better than that in urine, as was observed for NMR. Conclusions: Plasma is a very reliable biologic source for the determination of NMR, robust to differences in these analytical protocols or assessment site. Impact: Together this indicates a reduced need for differential interpretation of plasma NMR results based on the approach used, allowing for direct comparison of different studies. (C)2015 AACR.
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