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Hair Loss News Archives
June 2005
Study links hair dyes to cancer
Cancer-causing compounds have been removed from hair dyes
Researchers have found more evidence that hair dyes may cause cancer.
Those who regularly dye their hair have a higher risk of developing lymphoma, a
European study involving nearly 5,000 women found.
Experts stressed some agents were removed from dyes in the 1970s when they were
found to be cancer causing.
However, they said people frequently exposed to dyes before this time, such as
hair dressers, should be aware of the risk and check for abnormal lumps.
It is reassuring to notice that dyes used in the last 25 years do not seem to
carry an increased risk
Researcher Professor Paolo Boffetta
Lymphomas are cancers of the lymphatic system, a network of vessels which form
part of the body's immune system, and carry other infection-fighting cells
called "lymphocytes", as well as draining dead cells away from the tissues.
The authors from the International Agency for Research on Cancer, France,
presented their findings at the International Conference on Malignant Lymphoma.
Among women who regularly used hair dye, their risk of developing lymphoma was
increased by 20% compared to women who had never dyed their hair before 1980.
About one third of women in Europe and North America, along with 10% of men
older than 40 years, use some type of hair dye, it is estimated.
Professor Paolo Boffetta said: "It is reassuring to notice that dyes used in the
last 25 years do not seem to carry an increased risk.
Mounting evidence
"It might still be premature to conclude that older dyes are causally related to
lymphoma, but this evidence is growing."
People using them now should not be alarmed
Professor Gordon McVie of the European Institute of Oncology
He said a study published in the Journal of the American Medical Association two
weeks ago also identified a link between lymphoma and older hair dyes.
However, this study found no link with other cancers such as breast and bladder
cancers, despite past concerns.
Professor Franco Cavalli, chairman of the conference, said: "In the last 20
years the frequency of lymphoma has doubled in the western world.
"While viruses and other infectious agents have possibly played the major role
in this epidemic, scientists have since long suspected that other chemicals
could be involved.
This study proving an increased frequency of lymphoma in women who regularly
used older types of hair dye is therefore very important.
"We probably need many more studies looking at the environmental agents in the
pathogenesis of lymphoma."
Professor Gordon McVie, senior consultant at the European Institute of Oncology,
said: "It is a large enough study to raise concern. But regulatory action has
been taken and the carcinogens have been removed from hair dyes, so people using
them now should not be alarmed.
"Hairdressers and people who have used hair dyes a lot in the past might be
advised to be alert and look out for any abnormal lumps and bumps."