The tumor was an IDC classified as pT1N1M0 with hormone receptor positivity (estrogen receptor ++, progesterone receptor (PR) +++, HER2 +) and was treated with surgery (modified radical mastectomy of the right breast), adjuvant chemotherapy (adriamycin and cyclophosphamide), radiation therapy (46 Gy) and endocrine therapy (tamoxifen). The gene discussed is ERBB2; the disease is neoplasm.