Intake of Vitamins D and A and Calcium and Risk of Non-Hodgkin Lymphoma: San Francisco Bay Area Population-Based Case-Control Study
ABSTRACT Several nutrients identified as potentially cancer protective have been inconsistently associated with non-Hodgkin lymphoma (NHL) risk. Dietary history data, including use of vitamin supplements, were collected using a semiquantitative food frequency questionnaire administered during in-person interviews with 4,133 participants (2,052 cases, 2,081 controls) in a San Francisco Bay Area population-based case-control study. Data were used to determine the association of intake levels of vitamins D and A and calcium with risk of NHL and NHL subtypes. Odds ratios (OR) and 95% confidence intervals (CI) were computed as estimates of relative risk using adjusted unconditional logistic regression. Increasing vitamin D intake from food and supplements was positively associated with NHL risk in men (5th quintile: OR = 1.6, 95% CI = 1.0-2.4, P(trend) = 0.07) and with diffuse large B-cell lymphoma (DLBCL) in women and men (5th quintile: OR = 1.6, 95% CI = 1.0-2.5, P(trend) = 0.02); that was largely due to the effect in men (P(trend) = 0.03). These results do not support a strong role for vitamin D intake with NHL risk, with the exception of a potential association for DLBCL risk in men. Our results should be interpreted conservatively until further investigation in larger pooled studies can be conducted to better assess the role of vitamin D intake in lymphomagenesis.
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ABSTRACT: Non-Hodgkin lymphoma (NHL) is among the ten most frequent malignancies in Europe and USA. Results for vitamin D status and risk of NHL have been inconsistent. The objective was to perform a meta-analysis to summarize the available evidence from case-control studies and cohort studies on the association of vitamin D status and the risk of NHL. We searched PubMed, ISI Web of Science, the Cochrane Library, EMBASE, and reference lists for relevant articles. Study-specific odds ratios (ORs) or relative risks and 95 % confidence intervals (CIs) were pooled using fixed-effects, random-effects, or linear regression dose-response models. Nine studies (eight case-control and one cohort studies) were included in the meta-analysis. The estimated summary OR for highest compared with lowest categories of vitamin D status was 1.03 (95 % CI 0.84, 1.26; heterogeneity I (2) = 57.5 %). The subgroup analysis showed the similar results for dietary vitamin D intake group (1.07; 95 % CI 0.82, 1.40) and serum 25-hydroxyvitamin D concentration values group (1.03; 95 % CI 0.84, 1.26). The pooling ORs of NHL most common subtypes were 1.05 (0.73, 1.52), 1.00 (0.63, 1.58), 1.10 (0.56, 2.14), and 1.69 (0.68, 4.20) for diffuse large B cell lymphoma, follicular lymphoma, small lymphocytic lymphomas/chronic lymphocytic leukemia, and T cell lymphoma. The result from the linear regression dose-response model was similar (p = 0.205). Higher vitamin D status does not play a protective role in risk of NHL or common NHL subtypes.Cancer Causes and Control 08/2014; 25(11). DOI:10.1007/s10552-014-0459-2 · 2.96 Impact Factor