Abstract
Background: Kidney cancer has several well-established risk factors, including smoking, obesity, and hypertension. These factors do not, however, completely account for its etiology. One previous study of vitamin D-binding protein (DBP) and risk of renal cell carcinoma found a striking inverse association that warranted replication.Methods: We conducted a nested case-control study in the American Cancer Society Cancer Prevention Study-II Nutrition Cohort to prospectively examine circulating DBP concentration and renal cell carcinoma risk. Cases (n = 87) were matched 1:1 to controls on gender, race, age (±5 years), and date of blood collection (±30 days). ORs and 95% confidence intervals (CIs) were estimated for quartiles of DBP using conditional logistic regression.Results: There was a statistically significant inverse trend across quartiles of DBP such that participants with higher DBP had a markedly decreased risk of renal cell carcinoma (vs. Q1: Q2 OR, 0.93; 95% CI, 0.41-2.11; Q3 OR, 0.42; 95% CI, 0.15-1.15; Q4 OR, 0.33; 95% CI, 0.10-1.06; Ptrend = 0.03).Conclusions: Our findings demonstrate a strong inverse association between circulating DBP and risk of renal cell carcinoma, supporting the findings from previous research.I...Continue Reading
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