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Posted by Catherine Cartwright-Jones on January 27, 2004 at 12:26:01:

In reply to: Study Links Some Hair Dyes to Kind of Cancer: NY Times Article posted by Carrie on January 27, 2004 at 11:29:47:

: Hello everyone -
:
: I usually post on the Henna Page mehndi forum, but they asked me to
: post this over here as well.
:
: -Carrie
:
: Study Links Some Hair Dyes to Kind of Cancer
: By MARY DUENWALD
:
: Published: January 24, 2004
:
:
: cientists have found more evidence for a possible link between non-
: Hodgkin's lymphoma and long-term use of dark hair dye. A study of
: more than 1,300 women in Connecticut shows that those who began
: coloring their hair before 1980 increased their chance of developing
: the disease by 40 percent.
:
: And among those who used permanent rather than nonpermanent dyes, who
: chose dark colors — browns, reds and black — and who dyed their hair
: frequently (eight times a year or more) for at least 25 years, the
: risk doubled, said Dr. Tongzhang Zheng, a Yale epidemiologist who led
: the study. The results are published in the current issue of the
: American Journal of Epidemiology.
:
: "For those who used light colors, there was no such increase in
: risk," Dr. Zheng noted.
:
: Nor was there significantly increased risk among women who used
: nonpermanent dyes. The difference between permanent and nonpermanent
: dyes is that permanent ones are mixed with an oxidizing agent. In
: that process, new chemicals are created, some of which may be
: carcinogenic, Dr. Zheng said.
:
: Non-Hodgkin's lymphoma is a form of cancer that begins in the body's
: lymph system. The average American woman has a 1-in-57 chance of
: developing the disease in her lifetime, according to the American
: Cancer Society. For a man, the chance is 1 in 48.
:
: Suspicions that hair dyes might increase cancer risk have been around
: since the 1970's, said Dr. Eugenia Calle, the cancer society's
: director of analytic epidemiology, but studies over the years have
: found no connection between the dyes and most forms of cancer.
:
: The Yale researchers and the National Cancer Institute are now
: looking into whether there are any genetic influences that might make
: certain women more likely to develop lymphoma after exposure to dye.
:
: Because all the studies done so far, including the latest one, have
: been observational rather than clinical, their findings do not
: provide evidence that hair dye causes lymphoma, said Gerald McEwen,
: vice president for science at the Cosmetic, Toiletry and Fragrance
: Association, a trade group in Washington.
:
: "There's no smoking gun here," Mr. McEwen said, "no causal
: relationship."
:
: In this study, the researchers found no increase in cancer risk among
: women who started dying their hair after 1980, no matter how
: frequently they did so or what color they used. In the late 1970's,
: hair dye makers stopped using certain coal-tar ingredients that had
: been found to cause cancer when fed to laboratory rats and mice.
:
: "This is the first study that's been able to look at the time period
: after 1980," said Dr. Shelia Hoar Zahm, deputy director of cancer
: epidemiology and genetics at the National Cancer Institute, who
: collaborated on the study. "It suggests that the later formulations
: are safer. If the risk is limited to those people who started use
: before 1980, it means we're really in better shape now."
:
: Another possibility, however, is that women have not had time to use
: the new products long enough for them to have any adverse effect, Dr.
: Zheng said. "It's very hard for us to say that now the products are
: safe," he said.
:
: Previous studies on the association between hair dye and non-
: Hodgkin's lymphoma have been mixed. A few have shown no association,
: but two, one done in 1988 and one in 1992, have suggested that there
: may be a link.
:
: If hair dye does play some role in lymphoma, Dr. Calle said, it would
: make sense that the darker colors, which have greater concentrations
: of ingredients, would have the strongest effect.

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: : Hello everyone - : : : : I usually post on the Henna Page mehndi forum, but they asked me to : : post this over here as well. : : : : -Carrie : : : : Study Links Some Hair Dyes to Kind of Cancer : : By MARY DUENWALD : : : : Published: January 24, 2004 : : : : : : cientists have found more evidence for a possible link between non- : : Hodgkin's lymphoma and long-term use of dark hair dye. A study of : : more than 1,300 women in Connecticut shows that those who began : : coloring their hair before 1980 increased their chance of developing : : the disease by 40 percent. : : : : And among those who used permanent rather than nonpermanent dyes, who : : chose dark colors — browns, reds and black — and who dyed their hair : : frequently (eight times a year or more) for at least 25 years, the : : risk doubled, said Dr. Tongzhang Zheng, a Yale epidemiologist who led : : the study. The results are published in the current issue of the : : American Journal of Epidemiology. : : : : "For those who used light colors, there was no such increase in : : risk," Dr. Zheng noted. : : : : Nor was there significantly increased risk among women who used : : nonpermanent dyes. The difference between permanent and nonpermanent : : dyes is that permanent ones are mixed with an oxidizing agent. In : : that process, new chemicals are created, some of which may be : : carcinogenic, Dr. Zheng said. : : : : Non-Hodgkin's lymphoma is a form of cancer that begins in the body's : : lymph system. The average American woman has a 1-in-57 chance of : : developing the disease in her lifetime, according to the American : : Cancer Society. For a man, the chance is 1 in 48. : : : : Suspicions that hair dyes might increase cancer risk have been around : : since the 1970's, said Dr. Eugenia Calle, the cancer society's : : director of analytic epidemiology, but studies over the years have : : found no connection between the dyes and most forms of cancer. : : : : The Yale researchers and the National Cancer Institute are now : : looking into whether there are any genetic influences that might make : : certain women more likely to develop lymphoma after exposure to dye. : : : : Because all the studies done so far, including the latest one, have : : been observational rather than clinical, their findings do not : : provide evidence that hair dye causes lymphoma, said Gerald McEwen, : : vice president for science at the Cosmetic, Toiletry and Fragrance : : Association, a trade group in Washington. : : : : "There's no smoking gun here," Mr. McEwen said, "no causal : : relationship." : : : : In this study, the researchers found no increase in cancer risk among : : women who started dying their hair after 1980, no matter how : : frequently they did so or what color they used. In the late 1970's, : : hair dye makers stopped using certain coal-tar ingredients that had : : been found to cause cancer when fed to laboratory rats and mice. : : : : "This is the first study that's been able to look at the time period : : after 1980," said Dr. Shelia Hoar Zahm, deputy director of cancer : : epidemiology and genetics at the National Cancer Institute, who : : collaborated on the study. "It suggests that the later formulations : : are safer. If the risk is limited to those people who started use : : before 1980, it means we're really in better shape now." : : : : Another possibility, however, is that women have not had time to use : : the new products long enough for them to have any adverse effect, Dr. : : Zheng said. "It's very hard for us to say that now the products are : : safe," he said. : : : : Previous studies on the association between hair dye and non- : : Hodgkin's lymphoma have been mixed. A few have shown no association, : : but two, one done in 1988 and one in 1992, have suggested that there : : may be a link. : : : : If hair dye does play some role in lymphoma, Dr. Calle said, it would : : make sense that the darker colors, which have greater concentrations : : of ingredients, would have the strongest effect.
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