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Abstract
Quercetin, a dietary flavonoid, has demonstrated anti‑cancer activity in prostate cancer cell lines, including reduced colony formation and increased apoptosis. This study evaluated whether dietary quercetin intake, measured via the National Cancer Institute’s Diet History Questionnaire, was associated with prostate cancer risk and prostate tissue inflammation among men receiving care at the Portland VA Medical Center. Using a case‑control design, quercetin intake was categorized into quartiles, and logistic regression assessed associations with cancer risk and inflammation. No statistically significant relationships were observed. These findings suggest dietary quercetin intake is not associated with prostate cancer risk or prostate inflammation in this population.