ERBB2 and breast cancer: After adjusting confounding factors, multivariate analysis revealed that T stage (T2: hazard ratio [HR] = 3.256, 95% CI = 1.013–10.462; T3: HR = 4.016, 95% CI = 1.195–13.492), LNM status (HR = 3.276, 95% CI = 1.857–5.778), tumor differentiation (poor: HR = 8.402, 95% CI = 2.403–26.926), HER2 (HR = 1.725; 95% CI = 1.083–2.748), and TB (HR = 1.871, 95% CI = 1.197–2.924) were independent prognostic factors of BC patients (Table 3).