SISTER STUDY RESEARCH

Hair Products and Non-Reproductive Cancer Risk

Use of hair straighteners and chemical relaxers has been associated with increased incidence of breast, uterine, and ovarian cancers, but their association with non-reproductive cancers has not been investigated. Among 46,287 women from the Sister Study, use of hair straighteners /chemical relaxers was associated with a higher incidence of thyroid cancer, non-Hodgkin's lymphoma, and pancreatic cancer, with little to no evidence of links to melanoma, lung cancer, leukemia, colorectal cancer or kidney cancer. Further research is needed to confirm these findings, but these results provide additional evidence that use of chemical hair products may increase cancer risk.

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Use of Hair Straighteners and Chemical Relaxers and Incidence of Non-Reproductive Cancers.