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Flow diagram of the patient selection process. In total, 174 patients with TNBC were considered as candidates. Of these, 132 patients who underwent preoperative chemotherapy and those with stage T2 or higher N1 or higher were excluded from the analysis. Finally, 42 T1N0M0 TNBC were included in the analysis and followed up until October 2022. NCCH, National Cancer Center Hospital; TNBC, triple-negative breast cancer; ISH, in situ hybridization.
