EGFR and neoplasm: In univariate analysis, age, clinical T stage, clinical TNM stage, neoadjuvant chemotherapy times, tumour size, type of surgery, Miller and Payne grade, pathological T stage, pathological TNM stage, positive lymph nodes, core needle biopsy (ER status), post‐operative pathology IHC (molecular subtype, ER status, Ki‐67 status, AR status, CK5/6 status, EGFR status, TOP2A status), lymph vessel invasion, PLR, SII, post‐operative chemotherapy, post‐operative radiotherapy.