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Axillary Recurrence After Sentinel Node Biopsy

¹ Feinberg School of Medicine, Northwestern University, 303 E. Chicago Avenue, Chicago, Illinois 60611
² Evanston Northwestern Healthcare, 2650 Ridge Avenue, Evanston, Illinois 60201

Correspondence: Address correspondence and reprint requests to: David J. Winchester, MD; E-mail: djwinch{at}northwestern.edu

Background: Sentinel node biopsy (SNB) has evolved as the standard of care in the surgical staging of breast cancer. This technique is accurate for surgical staging of axillary nodal disease. We hypothesized that axillary recurrence after SNB is rare and that SNB may provide regional control in patients with microscopic nodal involvement.

Methods: With institutional review board approval, SNB was performed with peritumoral injection of ^99mTc-labeled sulfur colloid. From 1996 to 2003, 1167 patients were entered into a prospective cancer database after surgical therapy; 916 patients consented to long-term follow-up. Fifty-two patients (5.7%) did not map successfully and were excluded, leading to a study population of 864 patients. The median follow-up was 27.4 months (range, 1–98 months).

Results: The median number of sentinel nodes harvested was 2, and 633 (73%) patients had negative sentinel nodes. Thirty (4.7%) of those sentinel node–negative patients underwent completion axillary dissection, whereas 592 (94%) patients were followed up with observation. A total of 231 (27%) had positive sentinel nodes: 158 (68%) of these patients underwent completion axillary dissection, and 73 (32%) were managed with observation alone. Two (.32%) patients who were sentinel node negative had an axillary recurrence; one of these patients had undergone completion axillary dissection. No patient in the observed sentinel node–positive group had an axillary recurrence (odds ratio, .37; P = .725).

Conclusions: On the basis of a median follow-up of 27.4 months, axillary recurrence after SNB is extraordinarily rare regardless of nodal involvement, thus indicating that this technique provides an accurate measure of axillary disease and may impart regional control for patients with node-positive disease.

Key Words: Sentinel node biopsy • Axillary recurrence • Breast cancer • Surgical staging

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