Abstract
Background: Magnetic sentinel lymph node biopsy (SLNB) is an emerging technique in the axillary staging of breast cancer. There is no evidence available to determine a suitable threshold of ex vivo magnetometer counts for node excision. Consequently, the ‘10 per cent rule’ derived from radioisotopes is applied. We assess the largest study of magnetic SLNB (SentiMAG Multicentre Trial) to determine the validity of the ’10 per cent rule’.
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