Abstract 2805: A pooled investigation of circulating 25-hydroxyvitamin D and non-Hodgkin lymphoma: The Cohort Consortium Vitamin D Pooling Project of Rarer Cancers

Abstract

Abstract Findings from several epidemiologic studies suggest that exposure to solar ultraviolet radiation may be associated with a reduced risk of non-Hodgkin lymphoma (NHL). These observations have led to speculation that vitamin D may protect against lymphomagenesis. To investigate this hypothesis, the authors conducted a pooled investigation of circulating 25-hydroxyvitamin D [25(OH)D] and subsequent NHL risk within ten cohorts participating in the Cohort Consortium Vitamin D Pooling Project of Rarer Cancers. Prediagnostic samples of serum or plasma from 1,353 cases and 1,778 controls were assayed for 25(OH)D by immunoassay at a single laboratory. Odds ratios (ORs) and 95% confidence intervals (CIs) relating categories of 25(OH)D concentration with NHL risk were calculated using conditional logistic regression models, with 50-<75 nmol/L used as the reference category. Analyses of common NHL histologic subtypes were performed using polytomous regression modeling. Overall, no evidence of association with NHL risk was observed for either low 25(OH)D concentration (<25 nmol/L: OR 1.08, 95% CI 0.78-1.50) or high concentration (≥100 nmol/L: OR 0.86, 95% CI 0.57-1.27), and a test for trend was not statistically significant (P = 0.68). Analyses of other measures of 25(OH)D {continuous log[25(OH)D], categories of 25(OH)D using sex/cohort/season-specific cutpoints, categories of season-adjusted residuals of predicted 25(OH)D} were similarly null, as were results from stratified analyses and investigations of histologic subtypes of NHL. These findings do not support the hypothesis that elevated circulating 25(OH)D levels are associated with reduced NHL risk. Future research investigating the biologic basis for the sunlight-NHL association should consider alternative mechanisms, such as immunologic effects. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 2805.