Clinicopathologic characteristics of age, sex, body mass index, operation time, sentinel study time, operation type, tumor size, pathologic stage, number of sentinel lymph nodes (SLNs), and length of the SB were ascertained from medical records collected for the SENORITA trial [6 (link)]. Sentinel study time is the time from the first injection of tracer to identification of the frozen biopsy result for the SLNs. The pathologic stage was classified according to the eighth edition of the American Joint Committee on Cancer Classification [11 ]. We also surveyed recurrence of the 25 patients enrolled from the prospectively collected clinical data in DIRAMS. This study was approved by the Institutional Review Board (IRB) of DIRAMS Cancer Center in Republic of Korea (IRB number D-1304–002-001).
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