The very small study reviewed here suggests that a special type of x-ray test (alpha-keratin diffraction pattern) done on hair found a unique ring pattern in the hair of women diagnosed with breast cancer. The x-ray test didn't find this ring pattern in the hair of women who weren't diagnosed with breast cancer.
Researchers think that breast cancer might change hair's chemistry or the hair's follicle (hair grows from the follicle).
The x-ray test wasn't perfect in detecting cancer. One woman (out of 13) diagnosed with breast cancer didn't have the ring pattern in her hair. Three women (out of 20) who didn't have breast cancer did have the ring pattern in their hair.
It's much too early to know whether this test will prove to be a reliable way to test for breast cancer. Stay tuned to breastcancer.org to learn about more advances in breast cancer diagnosis and treatment.
NEW YORK (Reuters Health) - Hair from women with breast cancer can be distinguished from hair obtained from women without the disease, researchers in Australia report.
When hair is exposed to X-rays, the radiation is diffracted in a distinctive pattern by the alpha-keratin that forms hair, the researchers explain in the International Journal of Cancer. Dr. Gary L. Corino and Dr. Peter W. French, based at Fermiscan Ltd in Sydney, used the technique to look at samples of hair from 13 patients diagnosed with breast cancer and 20 healthy subjects.
Hair was cut as close to the skin as possible to obtain samples of the most recent hair growth. The investigators "successfully and consistently generated the basic alpha-keratin X-ray diffraction pattern in every hair sample."
Hair from the breast cancer patients produced the same features "with the only difference being the superimposition of a new feature." This was a distinctive low-intensity ring.
This ring sign was fairly accurate in identifying breast cancer. It missed one of the breast cancer patients, and showed up as a false-positive in three of the healthy subject.
The researchers went on to study a length of hair representing 6 months' growth from a breast cancer patient whose hair fell out following chemotherapy. X-ray diffraction at three points along the hair showed clear evidence of the ring at the position furthest from the hair root, a fainter ring at the middle point, and complete absence of the ring close to the root.
"This progressive reduction in the intensity of the ring appears to correlate with the patient's course of treatment and possibly indicates the eradication of the cancer as a result of that treatment," Corino and French suggest.
As for the reason for the ring pattern, they suggest it may represent "incorporation of extraneous lipid material into the fiber as a result of the presence of a tumor." It may also be that the disease affects hair follicles in some way.
Further testing is needed to establish the accuracy of this methodology as a diagnostic test for breast cancer, they conclude.
SOURCE: International Journal of Cancer, February 15, 2008.
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