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An example of complete pathologic response in a 52-year-old woman with palpable mass who underwent neoadjuvant chemotherapy: (a1) the tumor measured 4.1 × 3.6 × 3.2 cm3 by breast imaging, (a2) the tumor disappeared after therapy, (b1) poorly differentiated infiltrating ductal carcinoma on core needle biopsy, and (b2) there is no residual tumor seen on post-neoadjuvant chemotherapy lumpectomy sample (H&E stain ×200 and ×400).
