Accuracy of sentinel node biopsy for breast cancer using blue dye alone

Blue dye alone (BDA), lymphoscintigraphy alone, or, a combination of the two techniques are used for sentinel node biopsy (SNB) in breast cancer. This study reviews the effectiveness of the SNB technique using BDA by measuring the node identification rate and comparing the cohort node positivity with expected rates from established nomograms. A consecutive case series was examined from the database. This included the learning experience of six surgeons. Patients with unifocal tumors estimated at less than 31 mm were eligible. The tumor and axillary nodal histology was recorded. Published data were then used to calculate and predict node positivity rates in the study according to the size and grade of the tumors. There were 332 SNB procedures from 2001 to 2008. BDA successfully identified nodes in 94.6% (314/332) of the cases. The identification rate improved with experience. In patients with invasive cancer, 28.4% (85/299) of SNB were found to be positive for metastases or micrometastases. The node identification rate and the node positivity rate were found to be within published predicted ranges for the size and grade of the study tumors. The SNB with BDA was found to be effective in identifying sentinel nodes (SLN) in breast cancer. Surgeon experience was a factor in the success of the technique. Rates of detecting metastases were consistent with internationally published data, suggesting that BDA may perform as well as other techniques in experienced hands.