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||Serum cytokine concentrations, flavonol intake and colorectal adenoma recurrence in the Polyp Prevention Trial.
||Bobe G, Murphy G, Albert PS, Sansbury LB, Lanza E, Schatzkin A, Colburn NH, Cross AJ
||Br J Cancer
||2010 Oct 26
||BACKGROUND: Serum cytokine concentrations may reflect inflammatory processes occurring during the development of colorectal neoplasms. Flavonols, bioactive compounds found in plant-based foods and beverages, may inhibit colorectal neoplasms partly by attenuating inflammation. METHODS: Using logistic regression, we estimated odds ratios (ORs) and 95% confidence intervals (CIs) to investigate the association between serum concentrations of interleukin (IL) Î², 2, 8, 10, 12p70, granulocyte macrophage colony stimulating factor, interferon-Î³, and tumour necrosis factor-Î±, measured over time, flavonol intake, estimated from a flavonol database used in conjunction with a food frequency questionnaire, and adenoma recurrence in 872 participants from the intervention arm of the Polyp Prevention Trial. RESULTS: Decreased IL-2 concentration during the trial increased the risk of any adenoma recurrence (4th vs 1st quartile, OR=1.68, 95% CI=1.13-2.49), whereas decreased IL-1Î² or IL-10 reduced the risk of advanced adenoma recurrence (OR=0.37, 95% CI=0.15-0.94; OR=0.39, 95% CI=0.15-0.98, respectively). Individuals with flavonol intake above the median (29.7 mg per day) and decreased cytokine concentrations had the lowest risk of advanced adenoma recurrence. CONCLUSION: Overall, no consistent associations were observed between serum cytokine profile and colorectal adenoma recurrence; however, decreased cytokine concentrations during high flavonol consumption may indicate prevention of colorectal neoplasms.