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Histological presentation of triple‐negative breast cancers that showed clinical progressive disease after neoadjuvant chemotherapy (NAC). (a–d). Invasive carcinomas, no special type, of nuclear grade 3, with high mitotic figures and atypical medullary features. Necrosis (b,d) is also seen. (e–h). Metaplastic carcinomas (MPCs). MPC with (e) squamous cell, (f) spindle cell, and (g and h) mesenchymal differentiation (H & E × 200).
