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||Use of hair dyes and risk of bladder cancer.
||Hartge P, Hoover R, Altman R, Austin DF, Cantor KP, Child MA, Key CR, Mason TJ, Marrett LD, Myers MH, Narayana AS, Silverman DT, Sullivan JW, Swanson GM, Thomas DB, West DW
||The relation between use of hair dyes and risk of bladder cancer was assessed using data from a case-control study of bladder cancer. Incident cases (2982) and general population controls (5782) were interviewed. The overall estimate of relative risk of bladder cancer for users of hair dyes was 1.0 (95%) confidence interval, 0.9 to 1.2) compared to nonusers. No consistent pattern of association was detected between bladder cancer risk and various indices of timing or intensity of exposure to hair dyes. Various explanations of the lack of association are discussed.