Ranjan Dutta1, Andreas Kluftinger2, Michael MacLeod2, Gary Kindrachuk3, Chris Baliski4. 1. Department of Surgical Oncology, British Columbia Cancer Agency, Kelowna, BC, Canada. 2. Department of Surgery, Kelowna General Hospital, Kelowna, BC, Canada. 3. Department of Radiology, Kelowna General Hospital, Kelowna, BC, Canada. 4. Department of Surgical Oncology, British Columbia Cancer Agency, Kelowna, BC, Canada; Department of Surgery, Kelowna General Hospital, Kelowna, BC, Canada. Electronic address: baliski@me.com.
Abstract
BACKGROUND: Sentinel lymph node (SLN) biopsy (SLNB) is an accurate and proven axillary staging procedure for early breast cancer. The aim of this study was to determine if the "10% rule" is applicable to the performance of SLNB at the investigators' institution and if the criteria used for SLNB at their institution could be refined to minimize the number of SLNs removed. METHODS: Retrospective analysis was conducted of a prospectively collected breast cancer SLNB database. Standard statistical methods were used for data analysis. RESULTS: Five hundred nine patients underwent a SLNB for breast cancer over a 5 year period. A mean of 2.5 SLNs were removed per patient. All patients with SLN metastasis were identified within the 1st 4 SLNs removed. CONCLUSIONS: The "10% rule" is best used as a guide at the investigators' institution. Strict adherence to this rule appears to result in the removal of an excessive number of lymph nodes, which may contribute to excessive health care costs and patient morbidity.
BACKGROUND: Sentinel lymph node (SLN) biopsy (SLNB) is an accurate and proven axillary staging procedure for early breast cancer. The aim of this study was to determine if the "10% rule" is applicable to the performance of SLNB at the investigators' institution and if the criteria used for SLNB at their institution could be refined to minimize the number of SLNs removed. METHODS: Retrospective analysis was conducted of a prospectively collected breast cancer SLNB database. Standard statistical methods were used for data analysis. RESULTS: Five hundred nine patients underwent a SLNB for breast cancer over a 5 year period. A mean of 2.5 SLNs were removed per patient. All patients with SLN metastasis were identified within the 1st 4 SLNs removed. CONCLUSIONS: The "10% rule" is best used as a guide at the investigators' institution. Strict adherence to this rule appears to result in the removal of an excessive number of lymph nodes, which may contribute to excessive health care costs and patient morbidity.
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