3 years ago

Hair product use and breast cancer risk among African American and White women.

Zirpoli G, Ambrosone CB, Demissie K, Rabkin A, Xing CY, Gonzalez BD, Llanos AAM, Hong CC, Bandera EV, Lin Y, Qin B
Exposures to carcinogens in hair products have been explored as breast cancer risk factors, yielding equivocal findings. We examined hair product use (hair dyes, chemical relaxers and cholesterol or placenta-containing conditioners) among African American (AA) and White women, and explored associations with breast cancer. Multivariable-adjusted models were used to estimate odds ratios (ORs) and 95% confidence intervals (CIs) to describe the associations of interest among 2,280 cases (1,508 AA and 772 White) and 2,005 controls (1,290 AA and 715 White). Among controls, hair dye use was more common among Whites than AAs (58% vs. 30%), while relaxer (88% vs. 5%) and deep conditioner use (59% vs. 6%) was more common among AAs. Among AAs, use of dark hair dye shades was associated with increased breast cancer risk (OR=1.51, 95% CI: 1.20-1.90) and use of dark shades (OR=1.72, 95% CI: 1.30-2.26) and higher frequency of use (OR=1.36, 95% CI: 1.01-1.84) were associated with ER+ disease. Among Whites, relaxer use (OR=1.74, 95% CI: 1.11- 2.74) and dual use of relaxers and hair dyes (OR=2.40, 95% CI: 1.35-4.27) was associated with breast cancer; use of dark hair dyes was associated with increased ER+ disease (OR=1.54, 95% CI: 1.01-2.33), and relaxer use was associated with increased ER- disease (OR=2.56, 95% CI: 1.06-6.16). These novel findings provide support a relationship between the use of some hair products and breast cancer. Further examinations of hair products as important exposures contributing to breast cancer carcinogenesis are necessary.

Publisher URL: https://www.ncbi.nlm.nih.gov/pubmed/28605409

DOI: PubMed:28605409

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