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AACR: Sun Exposure May Protect Against Non-Hodgkin Lymphoma By Charlene Laino ORLANDO, FL -- March 31, 2004 -- Exposure to sunlight may protect against non-Hodgkin lymphoma (NHL), a population-based case-control study suggests. Bruce K. Armstrong, PhD, Professor of Public Health and Head, School of Public Health, University of Sydney, Sydney, Australia, presented the findings here on March 30th at the American Association for Cancer Research 95th Annual Meeting. Dr. Armstrong said the results were the opposite of what his team had set out to show. "Since the risk of NHL is increased in people with a history of skin cancer and there is evidence that NHL can be caused by suppression of T cell, our hypothesis was that we would see a causal effect [between sun exposure and NHL]. Instead sun exposure was protective." For the study, the researchers identified 704 patients with NHL, aged 20 years to 74 years, from the Australian cancer registry. The researchers also randomly selected from state electoral rolls 694 controls matched by age, sex and state of residence. Time spent outdoors was measured using a self-administered questionnaire and a telephone interview at 10, 20, 30, 40, 50 and 60 years of age. Dr. Armstrong said that studies using chemical dosimeters have shown that time spent outdoors correlates with sun exposure. Multivariate logistic regression showed that people in the highest quartile for total outdoor time were 35% less likely to develop NHL than those in the lowest quartile (P = .01 for trend). Those in the highest quartile for outdoor time on non-working days were 53% less likely to have NHL (P = .0001 for trend). "There was an inverse relationship between sunlight exposure and incidence of non-Hodgkin lymphoma -- the more sunlight, the less the risk," Dr. Armstrong said. He noted that the effects were stronger in women than men, with the greatest protective effect seen in people who spent the greatest amount of time outdoors as children. While the study was not designed to find out how the sun protects against NHL, Dr. Armstrong suggested that ultraviolet mediated synthesis of vitamin D in the skin is a plausible mechanism. [Study title: Sun Exposure May Protect Against Non-Hodgkin Lymphoma: A Case-Control Study. Abstract LB-228] E-mail this page to a friend or colleague! To print, use this version