Temporal stability of urinary and plasma biomarkers of tobacco smoke exposure among cigarette smokers

Abstract

Intraindividual variability of measurements of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), nicotine, cotinine, and r-1,t-2,3,c-4-tetrahydroxy-1,2,3,4-tetrahydrophenanthrene (PheT) over time is uncertain. From 70 habitual smokers’ plasma and urine sampled bimonthly for a year we analysed plasma for NNAL, cotinine and PheT, and urine for NNAL, cotinine and nicotine. We estimated the intraclass correlation coefficients (ρ_I) for each measurement. Plasma and creatinine-corrected urinary NNAL were stable (ρ_I ≥70%); plasma PheT and plasma and urinary total cotinine were fairly stable (ρ_I ≥50%), but urinary nicotine ρ_I ≈ 40% was not. Except for nicotine, single measurements from plasma or urine adequately represent individual mean exposure over time.

Keywords::

• Tobacco carcinogens
• NNK
• NNAL
• phenanthrene tetraol
• intraclass correlation coefficient

Acknowledgements

This research was partially funded by National Institutes of Health grant DA-13333 to the University of Minnesota.

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.