Harling M, Schablon A, Schedlbauer G, et al. Bladder cancer among hairdressers: a meta-analysis. Occup Environ Med. 2010 May;67(5):351-8. Review. PubMed PMID: 20447989; PubMed Central PMCID: PMC2981018. [Free full text via PubMed.]
Epidemiologists at the Institution for Statutory Accident Insurance and Prevention in the Health and Welfare Services and the University Medical Center Hamburg-Eppendorf conducted a meta-analysis of 42 studies to determine summary risk ratios for the risk of bladder cancer among hairdressers.
The researchers found an increased risk for bladder cancer, in particular for hairdressers in jobs held for more than 10 years. They noted, however, that they could not rule out residual confounding by smoking and that it is still an open question whether hairdressers working before and after 1980 (when some aromatic amines were banned as hair dye ingredients in the European Union) have the same risk for bladder cancer.
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