Word: dyes
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Dates: during 1990-1999
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...Harvard study used data derived from a larger ongoing survey of 120,000 nurses from 11 states who answer questions every two years. Of the nurses who used hair dye from 1976 until 1982, none showed an increased risk for cancer...
...results prompted companies to replace the mutagens in their hair dye products with safer alternative chemicals, Ames said...
...know hair dye seeps through the scalp into the blood, which could cause blood cancers--leukemia or lymphomass," said Dr. Francine Grodstein, co-author of the study and a teaching fellow in epidemiology at the School of Public Health...
...according to Harvard epidemiologists, the presence of mutagens in hair dye doesn't necessarily prove the dye is significant in causing cancer...
Bleached blondes may take comfort in the study, but for those dying their hair black, the scientific results are less encouraging. A separate study published in February by the American Cancer Society found a 6 percent increase in cancer in those who had used black dye for a long period of time...