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This is a malignant tumor. It is invasive ductal carcinoma/ tubular carcinoma. This tumor is Grade by by Nottingham grading system. Grade 1 tumors are mostly Luminal A type. Please take a look at the Molecular subtypes of Breast Carcinoma https://pathfiles.com/index.php/2020/08/19/molecular-subtypes-of-breast-cancer/ . If by IHC Her-2 neu is equivocal, Her-2 amplification study would be the next best step.