Objective. Sentinel lymph node (SLN) biopsy has replaced axillary lymph node dissection (ALND) as the staging procedure for breast cancer. SLN biopsy causes less morbidity and is more cost effective than complete ALND. Lymphatic mapping and SLN biopsy have a low false-negative rate, but long-term outcomes in large consecutive series of patients are unavailable. Methods. Retrospective review of a prospectively accrued institutional breast cancer database was performed. The initial mapping of 1,528 patients with invasive breast cancer that demonstrated negative sentinel node biopsy and no axillary dissection in 1,530 cases between January 1995 and June 2003 were collated and reviewed to achieve a long-term follow-up. These 1,528 patients were reviewed for follow-up time, local recurrences, distant metastases, and survival. Results. A total of 1,530 consecutively mapped invasive breast cancer cases had negative SLN biopsy and no ALND. The mean invasive tumor size of was 1.40 cm. Of patients, 1,212 (79.2%) underwent lumpectomy and 318 (20.8%) underwent mastectomy. Median follow-up was 63 months (range 0.1-144 months). There have been 4 (0.26%) cases presenting with local axillary recurrences, 54 (3.53%) cases presenting with local recurrences in the ipsilateral breast/chest wall, and 24 (1.57%) cases presenting with distant metastases. Conclusion. These data confirm that SLN biopsy is an effective and safe alternative to ALND for detection of nodal metastases in patients with invasive breast cancer and validates its use as the standard tool for nodal staging.The status of the axillary nodal basin is one of the most important prognostic indicators for recurrence and survival in patients with breast cancer.1,2 Until the introduction of sentinel node mapping in the early 1990 s, the standard operation for staging the axilla involved level I and II axillary nodal dissection. This operation provided maximum local control of cancer while providing valuable staging information that guided additional treatment choices and provided prognostic information for patients and clinicians alike. Unfortunately, the advantages of axillary dissection did not come without significant morbidity. Acute and chronic lymphedema, paresthesia and pain from intercostal and intercostal-brachial nerve injury, and seromas from axillary dissections made the ramifications of this surgery some of the most significant complaints relating to breast cancer treatment. As screening mammography and breast cancer awareness increased, the percentage of patients with positive lymph nodes decreased to approximately 30%. 4 As a result, 70% of patients with breast cancer were taking on the The online version of the original article can be found under