A researcher calls the findings 'meaningful but small.'
The findings, published in the International Journal of Cancer, are based on data from 46,709 women enrolled in the Sister Study, named for the fact that all had a sister diagnosed with breast cancer but were cancer-free themselves.
At the start of the study, all women filled out questionnaires about the hair products they used in the past year. More than half of all the women, 55 percent reported using permanent dye and 75 percent of black women said they used chemical straighteners. Overall, they saw a 9 percent higher breast cancer risk among women who used permanent dye compared to those who skipped such products. Permanent hair dyes are both sold in drug stores and used in salons. There was little or no associated risk for semi-permanent or temporary dye use.
Previous research has found products designed for black women may contain higher concentrations of estrogens and more endocrine disrupting chemicals. Some straighteners contain formaldehyde, a known carcinogen. All of it may be a factor in the increased risk in black women, White speculated.What women should know:
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