In June 2020, immunohistochemical and fluorescence in situ hybridization analyses of a fresh tumor biopsy from an axillary lymph node metastasis confirmed HER2 overexpression and amplification (immunohistochemistry 3+ FISH-amplified per HercepTest and HER2 IQFISH; estrogen receptor 0%, progesterone receptor 0%). This evidence concerns the gene ERBB2 and neoplasm.