Ductal lavage may not detect breast cancer, study finds

Ductal lavage is not an effective method for detecting breast cancer, according to a new study in the October 20 issue of the Journal of the National Cancer Institute.

Ductal lavage--a method used to collect cells from the milk ducts of the breast--has been proposed as a screening tool for cancer detection because ducts that yield fluid were thought to be more likely to contain cancer cells. Interest in the procedure was spurred by a study in which ductal lavage detected cancer in four of 11 women who had shown no previous evidence of a malignancy.

To determine the sensitivity and specificity of ductal lavage in the presence of known breast cancer, Seema A. Khan, M.D., of the Lynn Sage Comprehensive Breast Center and Northwestern Memorial Hospital in Chicago, and colleagues conducted a pilot study in which ductal lavage was performed prior to mastectomy on 44 breasts from 32 women with known cancer and on eight breasts from seven women undergoing prophylactic mastectomy.

The researchers found poor agreement between a cytologic analysis of the cells from ductal lavage and results from looking at breast tissue under the microscope. In breasts with cancer, ductal lavage was able to detect only about half of the cancers, possibly because ducts that contain cancer failed to yield fluid or yielded cells classified as benign or mildly atypical. In addition, ducts that produced fluid did not appear to be related to the cancer in about half of the cancer-containing breasts.

"Although further studies are warranted in women with early lesions, our results and those of others indicate that ductal lavage should not be recommended to high-risk women as a technique to detect cancer earlier than imaging modalities," the authors write.

In an editorial, Carol J. Fabian, M.D., of the University of Kansas Medical Center in Kansas City, and colleagues review several other ongoing studies that are attempting to evaluate the utility of duct

Contact: Sarah L. Zielinski
Journal of the National Cancer Institute

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