两组在行腋窝淋巴结清扫前，均接受前哨淋巴结活检。

All of them were performed sentinel lymph nodes biopsy before axillary dissection.

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因为腋窝前哨淋巴结活检的假阴性率低，故对前哨淋巴结阴性的病人可以不做进一步腋窝淋巴结清扫。

Because the low false negative rate of SLN biopsy, the technique allows axillary lymph node dissection (ALND) avoided if the SLN is negative.

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方法：我们随机分配女性乳腺癌患者接受前哨淋巴结活检和腋窝淋巴结清扫或只接受前哨淋巴结活检。

Methods We randomly assigned women with breast cancer to sentinel-lymph-node biopsy plus axillary dissection or sentinel-lymph-node biopsy alone.

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