ERBB2 and neoplasm: The prevailing staging method for BC is the American Joint Committee on Cancer TNM system, which relies on seven criteria: tumour extent (T), dissemination to adjacent lymph nodes (N), presence of remote metastases (M), tumour grading (G), oestrogen receptor (ER) status, progesterone receptor status (PR), and human epidermal growth factor receptors (HER2) status [5].