• Mara Z Vitolins, CaseL DouglasLDDivision of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA., Stephen R Rapp, Mark O Lively, Edward G Shaw, Michelle J Naughton, Jeffrey Giguere, and Glenn J Lesser.
• Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA.
• Patient Prefer Adher. 2018 Jan 1; 12: 637-646.

PurposeWomen with breast cancer were randomized to receive coenzyme Q10 (CoQ10) plus Vitamin E or placebo in a clinical trial. The objective of this evaluation is to examine the association between participant self-reported adherence to the study supplements and changes in plasma biomarker levels.Patients And MethodsCorrelation coefficients quantified the association between changes in alpha-tocopherol and CoQ10 levels and the association between self-reported adherence and changes in biomarkers. Participants were categorized by self-reported adherence; Kruskal- Wallis tests compared changes in alpha-tocopherol and CoQ10 levels between self-reported adherence groups.ResultsWomen (N=155) provided baseline and post-treatment biomarkers; 147 completed at least one diary. While changes in alpha-tocopherol and CoQ10 levels were moderately correlated, correlations ranged from 0.40 to 0.48, association between self-reported adherence and plasma alpha-tocopherol or CoQ10 levels was weak; correlations ranged from 0.10 to 0.29 at weeks 8, 16, and 24. Some participants with high self-reported adherence actually had decreases in their biomarker levels.ConclusionThese findings support that self-reported adherence is likely to be overestimated. Biological and other measures of adherence that can better identify true adherence to study pills provided in clinical trials are greatly needed as they may assist in improving the interpretation of findings of future clinical trials.

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