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Does dichlorvos cause cancer in laboratory animals?
In one study, female mice that were fed high doses of dichlorvos over a long time had a higher frequency of stomach cancers than untreated mice. High doses of dichlorvos fed over two years caused an increase in the number of male rats that had pancreatic tumors and leukemia, (a type of cancer that affects the blood).
Does dichlorvos cause cancer in humans?
The risk for developing non-Hodgkin's lymphoma or multiple myeloma (cancers that affect the blood) was not significantly affected in male farmers who had used dichlorvos. A higher number of leukemia cases were reported in one study among male farmers who used dichlorvos for more than ten days per year, compared to those who had not used dichlorvos. A higher number of childhood brain cancer cases were reported among families that used dichlorvos, than families that did not. Both of these studies looked at a very small number of people who were also exposed to other chemicals, making it difficult to determine if dichlorvos was the cause of the cancers. However, the results indicate the need for larger studies on humans who may have been exposed to dichlorvos in their past, especially during childhood.
Does dichlorvos cause breast cancer?
No studies of breast cancer rates in women exposed to dichlorvos were found. One study reported that laboratory rats that were fed dichlorvos for two years had a higher number of benign mammary (breast) tumors than other rats. Malignant mammary tumors were not increased significantly in the dichlorvos-fed rats. This result needs to be confirmed in another rat study.
How can dichlorvos affect breast cancer risk?
Mice that were treated with leukemia-causing cells were found to develop leukemia faster if they were also fed dichlorvos. This result indicates that dichlorvos may increase the effect of another cancer-causing agent, or act as a "tumor promoter." However, researchers have not tested experimental animals with breast cancer-causing cells or chemicals to see if dichlorvos can or cannot "promote" breast tumors.
The immune system helps the body to fight against infection and cancer. There is a concern that chemicals that damage the immune system may also affect cancer risk. Dichlorvos was found to weaken or suppress the immune system in experimental animals. However, the animals with the immune suppression were not tested for the ability to fight breast cancer.
Is dichlorvos present in breast milk?
Dichlorvos does not persist or accumulate in the breast tissue or breast fat. There has been only one report of the presence of dichlorvos in breast milk, in a single sample of breast milk from Taiwan.
Conclusions
No studies were available on breast cancer incidences in women exposed to dichlorvos to assess whether dichlorvos increases breast cancer risk in humans. The evidence for the breast cancer risk from dichlorvos is limited to the one study in experimental rats in which it caused an increase in the frequency of benign mammary tumors only. Hence, we conclude that at the present time the evidence is not adequate to determine whether dichlorvos is a human breast carcinogen.
While the evidence specific to breast cancer risk is not adequate, we advise caution when dealing with this insecticide for the following reasons: there is sufficient evidence for its carcinogenic potential at other, non-mammary sites in experimental animals, and limited evidence that it may affect cancer risk by causing immune suppression, or by acting as a tumor promoter.
The potential for high exposures for the general population is extremely low since use of dichlorvos has become restricted and it does not remain in the environment for long periods of time. However, dichlorvos was once a very popular insecticide and hence we recommend that populations exposed in the past be followed for breast cancer incidence.
