Fig. 1From: A solitary brain metastasis as the only site of recurrence of HR positive, HER2 negative breast cancer: a case report and review of the literaturea Primary invasive ductal carcinoma (left breast lesion, core needle biopsy). Hematoxylin & Eosin (H & E) stain, ×50. b Expression of estrogen receptors (left breast lesion, core needle biopsy), immunohistochemical (IHC) stain, ×50.Back to article page