To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.amjsurg.2004.08.053 Byline: Richard J. Gray (a), Barbara A. Pockaj (a), Michael C. Roarke (b) Keywords: Breast cancer; Sentinel node; Radiocolloid; Technique Abstract: We investigated whether the timing of injection of.sup.99mTc-labeled sulfur colloid (radiocolloid) significantly influenced the success of breast cancer sentinel lymph node (SLN) mapping. Author Affiliation: (a) Department of Surgery, Section of Surgical Oncology, CB Surgery, Mayo Clinic, Scottsdale, AZ 85259, USA (b) Department of Diagnostic Radiology, Section of Nuclear Medicine, Mayo Clinic, Scottsdale, AZ, USA Article History: Received 20 July 2004; Revised 7 August 2004