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Morphological features of DCIS at baseline (A) and corresponding post-treatment (B, C) (Case 1). Increased periductal fibrosis (B) and infiltration of foam cells (C) were observed after the letrozole treatment as shown by arrows. Hematoxylin and eosin (HE) staining. Bar=100 μm, respectively. A full colour version of this figure is available at the British Journal of Cancer journal online.
