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Personal Use of Hair Dye and the Risk of Certain Subtypes of Non-Hodgkin Lymphoma

Personal use of hair dye has been inconsistently linked to risk of non-Hodgkin lymphoma (NHL), perhaps because of small samples or a lack of detailed information on personal hair-dye use in previous studies. This study included 4,461 NHL cases and 5,799 controls from the International Lymphoma Epidemiology Consortium 1988–2003. Increased risk of NHL (odds ratio (OR) = 1.3, 95% confidence interval (CI): 1.1, 1.4) associated with hair-dye use was observed among women who began using hair dye before 1980. Analyses by NHL subtype showed increased risk for follicular lymphoma (FL) and chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) but not for other NHL subtypes. The increased risks of FL (OR = 1.4, 95% CI: 1.1, 1.9) and CLL/SLL (OR = 1.5, 95% CI: 1.1, 2.0) were mainly observed among women who started using hair dyes before 1980. For women who began using hair dye in 1980 or afterward, increased FL risk was limited to users of dark-colored dyes (OR = 1.5, 95% CI: 1.1, 2.0). These results indicate that personal hair-dye use may play a role in risks of FL and CLL/SLL in women who started use before 1980 and that increased risk of FL among women who started use during or after 1980 cannot be excluded.

Published on 10-27-2008
Authors: Yawei Zhang1, Silvia De Sanjose2, Paige M. Bracci3, Lindsay M. Morton4, Rong Wang1, Paul Brennan5, Patricia Hartge4, Paolo Boffetta5, Nikolaus Becker6, Marc Maynadie7, Lenka Foretova8, Pierluigi Cocco9, Anthony Staines10, Theodore Holford1, Elizabeth A. Holly3, Alexandra Nieters6, Yolanda Benavente2, Leslie Bernstein11, Shelia Hoar Zahm4 and Tongzhang Zheng1
Source: American Journal of Epidemiology Advance Access originally published online on April 11, 2008