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<正>1文献来源Mamounas EP,Tang G,Fisher B,et al.Association between the 21-gene recurrence score assay and risk of locoregional recurrence in node-negative,estrogen receptor-positive breast cancer:Results from NSABP B-14 and NSABP B-20[J].J Clin Oncol,2010,28(10):1677-1683.2证据水平1b。