ORLANDO—The routine use of ductal lavage in a high-risk breast surgical oncology practice will identify many patients who may benefit substantially from chemoprevention with tamoxifen(Drug information on tamoxifen) (Nolvadex), and may detect rare contralateral breast cancers missed by traditional methods, according to a report at the 38th Annual Meeting of the American Society of Clinical Oncology (abstract 193).
William C. Dooley, MD, professor of surgery and medical director of the Institute for Breast Health at the University of Oklahoma Health Sciences Center, reported on 77 women who underwent intraoperative ductal lavage. The study included 68 patients undergoing surgery for stage 0-II primary breast cancer; 5 patients with elevated breast cancer risk by the Gail model who underwent microductectomy for pathologic nipple discharge; and 4 patients who underwent re-excision of core-biopsy-proven atypical ductal or lobular hyperplasia.
All patients had at least one fluid-producing duct in the normal contralateral breast, which was successfully cannulated for ductal lavage in the operating room at the time of the surgical procedure. Cytologic diagnoses from the contralateral procedure revealed 19 patients (25%) with atypia, 16 (21%) with a hypocellular specimen, and 42 (55%) with benign cells.
In 15 patients with the finding of contralateral atypia—78% of all patients with atypia and 19% of all 77 patients—this information changed the management of the patient’s breast disease. This was usually the addition of tamoxifen as a chemo-preventive strategy where it would not have been prescribed without the information from the contralateral breast, Dr. Dooley reported.
In one case, the finding of atypia led to the diagnosis of an occult malignancy that was clinically and radiologically unsuspected.
The study adds to data from a previous larger multicenter study in which these authors participated. In that study, ductal lavage in high-risk women revealed abnormal cells in 93 of 383 women (24%). The abnormal cytology fell into the following categories: 17% mildly atypical, 6% markedly atypical, and 0.5% malignant.
Ductal lavage resulted in the collection of significantly more ductal epithelial cells than did the traditional collection method of nipple aspiration with a manual suction cup. The rate of adequate specimen collection and the diagnostic sensitivity were significantly higher with ductal lavage; fluid-yielding ducts were identified in 84% of subjects; and the concordance with the initial independent cytologic diagnosis was 89%.
