| Women want the dye to be present on the hair, | | | | to develop ovarian cancer. Women who smoke |
| but not on the scalp. Among women with other | | | | and use permanent hair dyes have an even |
| slow genes (the "CYP1A2 slow" phenotype), | | | | higher risk of cancer. |
| exclusive permanent hair dye use was | | | | |
| associated with a 2.5-fold increased risk. | | | | More studies might look at the risk of cancer |
| | | | from exposure to hair dye at work, which the |
| Large epidemiological studies show no | | | | researchers excluded from this analysis. For |
| elevated health risk for women using hair | | | | hematopoietic cancers, studies found a |
| dyes. Now, an equally important part of the | | | | slightly increased risk of cancer in people |
| study is those women who were not at | | | | who had used hair dye. For bladder cancer and |
| increased risk despite using the hair dye. It | | | | breast cancer, the results indicate that |
| state that women who used permanent hair dye | | | | there was no effect of hair dye use on cancer |
| once a month had a 25% higher rate of bladder | | | | risk. |
| cancer. | | | | |
| | | | Risk of salivary cancer increased three times |
| Women who dye their hair might be different | | | | in hair dye users and risk of brain and |
| from the average woman in many ways. Those | | | | ovarian cancer almost doubled. Personal use |
| women have turned to at home hair dye kits. I | | | | of hair dyes and risk of cancer: a |
| heard of women going bald from over-dyeing | | | | meta-analysis. The researchers found no |
| their hair, or braiding it. The study of | | | | strong evidence of a link between personal |
| 1,300 women claims that those who started | | | | hair dye use and an increase in cancer risk. |
| dyeing their hair before 1980 were one-third | | | | But researchers have not been able to find a |
| more likely to develop NHL. The researchers | | | | clear link between using hair dye and cancer |
| did not find any larger risk of cancer in | | | | risk, including the risk of breast cancer. |
| women who started using hair dye later than | | | | Take-home message. This study supports |
| 1980. The exception was women who used black | | | | previous research that found no link between |
| hair dye for more than 20 years. Another | | | | hair dye use and increased risk for breast |
| study found that women who dyed their hair | | | | cancer. |
| one to four times a year had a greater risk | | | | |