ObjectiveTo define preliminary guidelines for the use of lymphatic mapping techniques in patients with breast cancer. Summary Background DataLymphatic mapping techniques have the potential of changing the standard of surgical care of patients with breast cancer. MethodsFour hundred sixty-six consecutive patients with newly diagnosed breast cancer underwent a prospective trial of intraoperative lymphatic mapping using a combination of vital blue dye and filtered technetium-labeled sulfur colloid. A sentinel lymph node (SLN) was defined as a blue node and/or a hot node with a 10:1 ex vivo gamma probe ratio of SLN to non-SLN. All SLNs were bivalved, step-sectioned, and examined with routine hematoxylin and eosin (H&E)

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These data suggest that the SCOUT system is safe and effective for guiding the excision of nonpalpable breast lesions and a viable alternative to standard localization options. A larger prospective, multi-institution trial of SCOUT currently is underway to validate these findings.

This study validates the prognostic stratification of patients with a complete pathologic axillary response to neoadjuvant chemotherapy. The addition of SLN biopsy to cN0 patients before treatment increased accurate nodal staging by 53%, eliminated completion axillary lymph node dissection in 15%, and demonstrated an improved prognosis in 28% of pCRAX patients. SLN biopsy before treatment provides accurate staging of cN0 patients; allows acquisition of standard treatment markers, prognostic biomarkers, and microarray analysis; and affords prognostic stratification after treatment.

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Radical chest wall resection can be done without mortality and acceptable morbidity to accomplish long-term palliation. The strongest predictor of overall survival was the triple-negative phenotype. Because the triple-negative phenotype is not amenable to any form of therapy, palliative resection may be warranted. Development of appropriate targeted therapies to this population of patients is critical.

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