ERBB2 and neoplasm: The values assigned to these variables were as follows: age at diagnosis ≤45 years old = “1”, >45 years old = “2”; histology grade: I = “1”, II = “2”, III = “3”; tumor size: ≤2 cm = “1”, 2.1–5 cm = “2”, >5 cm = “3”; axillary lymph node metastasis: 0 = “1”, 1–3 = “2”, 4–9 = “3”, >10 = “4”; XRCC3, RAD51, ER, PR, HER2: low expression or negative = “1”, high expression or positive = “2”.