Objective: To investigate the association between maternal exposure to hair dyes and hair straighteningcosmetics (HDSC) during pregnancy and leukemia at an early age (<2 yr., EAL).Methods: A multicenter hospital-based case-control study was carried out in 13 states in Brazil between1999 and 2007. Mothers of 176 ALL (acute lymphocytic leukemia) and 55 AML (acute myeloid leukemia)cases and 419 controls were enrolled and interviewed. Data on maternal exposure to HDSC occurring3 months before pregnancy, during pregnancy and during breastfeeding were obtained. Data were alsogathered on paternal exposure to HDSC before pregnancy. Unconditional logistic regression wasperformed and odds ratios (OR) on the association between HDSC use and EAL were obtained afteradjustment for hormonal intake during pregnancy, maternal age, education, birth weight, and the childskin color.Results: An adjusted OR of 1.78 (95% C.I. 1.13–2.81) was observed between maternal exposure to HDSC inthe first trimester of pregnancy and ALL. Regarding AML, an adjusted OR of 2.43 (95% C.I. 1.13–5.22) wasfound for maternal exposure to HDSC during breastfeeding. No association between maternal exposure toHDSC during pregnancy and ALL or AML was observed in children with MLL (Mixed Lineage Leukemia)gene rearrangement.Conclusions: Results in this study seem to support the hypothesis that maternal exposure to HDSC duringการตั้งครรภ์อาจจะมีในสาเหตุของมะเร็งเม็ดเลือดขาวในเด็กอายุต่ำกว่า 2 ปี
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