Multivariate analysis confirmed that poor OS was significantly associated with high JAG1 expression (HR, 7.097; 95% CI: 1.671–30.146; P = 0.008) as well as TNBC (HR, 2.189; 95% CI: 1.209–3.962; P = 0.010), lymph node metastasis (HR, 4.396; 95% CI: 1.370–14.104; P = 0.013), distant metastasis (HR, 11.002; 95% CI: 4.880–24.803; P < 0.001), and the TNM stage (HR, 1.853; 95% CI: 1.178–2.719; P = 0.004) (Table 2). Here, JAG1 is linked to metastatic malignant neoplasm in the lymph nodes.