ERBB2 and metastatic malignant neoplasm in the lymph nodes: Furthermore, multivariate analysis indicated that lymph node metastasis (HR = 3.12, 95% CI = 1.65–5.78, p = 0.018), ER status (HR = 2.75, 95% CI = 1.38–5.26, p = 0.021), HER2 status (HR = 3.51, 95% CI = 1.92–6.24, p = 0.014), TNM stage (HR = 4.75, 95% CI = 2.74–8.32, p < 0.001), and serum exosomal lncRNA DANCR expression (HR = 3.86, 95% CI = 2.16–6.63, p = 0.009) were significant independent prognostic markers for shorter OS (Table 3).