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Study: Permanent hair dye may up cancer risk in women
The results showed an increased risk of three types of breast cancer - estrogen receptor-negative, progesterone receptor-negative, and hormone receptor-negative - and ovarian cancer was also linked to use of permanent dyes, with risk rising according to the cumulative amount of dye women were exposed to.
An increased risk of Hodgkin lymphoma was also seen with the use of permanent hair dye but only for women with naturally dark hair.
"Possible explanations could be that shades of permanent hair dyes are associated with the concentration of ingredients, with darker colours having higher concentrations," the study authors said.
However, the results showed no increased risk of most cancers or of cancer death in women who reported having ever used permanent hair dyes compared with those who had never used such dyes.
The authors also pointed to some limitations, including the lack of racial diversity of study participants and the possibility that other unmeasured factors, such as use of other products, may have affected the results.
Nevertheless, the authors said their findings "offer some reassurance against concerns that personal use of permanent hair dyes might be associated with increased cancer risk or mortality."
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