Scientists are uncovering new details in the connection between using certain hair straightening products, such as chemical relaxers and pressing products, and an increased risk of cancer in women.
Ongoing research previously suggested that hair straightening chemicals are associated with an increased risk of certain hormone-related cancers, including breast and ovarian cancers, and now, a new study links use of hair straightening products with an increased risk of uterine cancer. Black women may be more affected due to higher use of the products, the researchers noted.
The study, published Monday in the Journal of the National Cancer Institute, estimates that among women who did not use hair-straightening chemical products in the past 12 months, 1.6% developed uterine cancer by age 70, but about 4% of the women who frequently use such hair-straightening products developed uterine cancer by age 70.
That finding “also communicates that uterine cancer is indeed rare. However, the doubling of risk does lead to some concern,” said Chandra Jackson, an author of the study and researcher at the National Institute of Environmental Health Sciences.
“In this study, women with frequent use in the past year had an over two-fold higher risk of uterine cancer,” she said. Frequent use was defined as more than four times in the previous year.
The new study includes data on nearly 34,000 women in the United States, ages 35 to 74, who completed questionnaires about their use of certain hair products, including perms, dyes, relaxers and straighteners. The researchers, from the National Institutes of Health, also tracked the incidence of cancer diagnoses within the study group.