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Women with breast cancer five times as likely to have pesticide (DDT) residues in their blood
April 23, 2003Women with breast cancer are five times as likely to have pesticide residues in their blood of organochlorines (DDT), which contain oestrogens, reveals a study of 159 women in Occupational and Environmental Medicine.
The possibility of such a link has attracted controversy, admit the authors, but say that their new study adds to the growing body of evidence for an association between environmental oestrogens and the rising incidence of breast cancer.
The authors base their findings on a study of 600 women referred for breast lumps between September 1999 and February 2000 to one hospital in Liége, Belgium.
Of the total, 159 women were diagnosed with breast cancer and subsequently admitted for the removal of the tumour or the whole breast. The women's average age was 54.
Before surgery or drug treatment, the women were tested for total levels of organocholorines (DDT) and hexachlorobenzene (HCB) in their blood.
This was done to ensure that the results would not be affected by weight changes brought about by chemotherapy and radiotherapy, so altering levels of fatty tissue where organochlorines accumulate.
DDT was effectively banned for use as a pesticide in the US in 1972, almost 30 years after it was introduced for this purpose. But DDT can remain active in tissues for up to 50 years.
The blood samples were compared with those taken from 250 healthy women, matched as closely as possible for age, menopausal status, reproductive history, and smoking habit.
The results showed significant differences between the two groups of women. Those with breast cancer were over five times as likely to have detectable levels of DDT above 0.5 parts per billion as the healthy women, and more than nine times as likely to have detectable levels of HCB in their blood. The highest levels detected were 20 parts per billion.
Some women's breast tumours are sensitised to, and sustained by, oestrogen. But DDT or HCB levels were no higher for the 102 women in this study to whom this applied.
The authors are quick to point out that while their research does not prove a definitive link between oestrogenic pesticide residues and breast cancer, there is plenty of published evidence on the ability of hormones to promote animal and human cancers. And research has shown that DDT, and its major metabolite DDE, have oestrogenic properties.
British Medical Journal (BMJ)
Of the total, 159 women were diagnosed with breast cancer and subsequently admitted for the removal of the tumour or the whole breast. The women's average age was 54.
Before surgery or drug treatment, the women were tested for total levels of organocholorines (DDT) and hexachlorobenzene (HCB) in their blood.
This was done to ensure that the results would not be affected by weight changes brought about by chemotherapy and radiotherapy, so altering levels of fatty tissue where organochlorines accumulate.
DDT was effectively banned for use as a pesticide in the US in 1972, almost 30 years after it was introduced for this purpose. But DDT can remain active in tissues for up to 50 years.
The blood samples were compared with those taken from 250 healthy women, matched as closely as possible for age, menopausal status, reproductive history, and smoking habit.
The results showed significant differences between the two groups of women. Those with breast cancer were over five times as likely to have detectable levels of DDT above 0.5 parts per billion as the healthy women, and more than nine times as likely to have detectable levels of HCB in their blood. The highest levels detected were 20 parts per billion.
Some women's breast tumours are sensitised to, and sustained by, oestrogen. But DDT or HCB levels were no higher for the 102 women in this study to whom this applied.
The authors are quick to point out that while their research does not prove a definitive link between oestrogenic pesticide residues and breast cancer, there is plenty of published evidence on the ability of hormones to promote animal and human cancers. And research has shown that DDT, and its major metabolite DDE, have oestrogenic properties.
British Medical Journal (BMJ)
Pesticide Current Events and Pesticide News RSSAn inexpensive 'dipstick' test for pesticides in foods
Scientists in Canada are reporting the development of a fast, inexpensive "dipstick" test to identify small amounts of pesticides that may exist in foods and beverages.
Pesticides exposure linked to suicidal thoughts
A new study in China has found that people with higher levels of pesticide exposure are more likely to have suicidal thoughts.
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Study shows more corn for biofuels would hurt water
More of the fertilizers and pesticides used to grow corn would find their way into nearby water sources if ethanol demands lead to planting more acres in corn, according to a Purdue University study.
New computing tool could lead to better crops and pesticides say researchers
A new computing tool that could help scientists predict how plants will react to different environmental conditions in order to create better crops, such as tastier and longer lasting tomatoes, is being developed by researchers.
Getting plants to rid themselves of pesticide residues
Scientists in China are reporting the "intriguing" discovery that a natural plant hormone, applied to crops, can help plants eliminate residues of certain pesticides.
Organic weed control for dandelions
Spring and summer often find homeowners out in their yards, busily attempting to control the onslaught of dandelions in a quest for green, weed-free lawns.
Environmental effects of cold-climate strawberry farming
Strawberries are America's fifth-favorite fruit, according to consumption rates. California and Florida grow more than 95% of the nation's strawberries; an additional 12,000 acres are planted in other states.
Pesticides -- easier detection of pollution and impact in rivers
The long-term effects of pesticides on living organisms in rivers and on water quality can now be assessed more easily.
Pitt research suggests EPA pesticide exposure test too short, overlooks long term effects
The four-day testing period the U.S. Environmental Protection Agency (EPA) commonly uses to determine safe levels of pesticide exposure for humans and animals could fail to account for the toxins' long-term effects, University of Pittsburgh researchers report in the September edition of Environmental Toxicology and Chemistry.
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