Furthermore, the Cox univariate hazard model for PFS showed that symptoms, size (≤2 cm vs. >2 cm), stage (I vs. II), and lymph nodes involvement were statistically significantly associated with PFS; however, in the multivariate Cox analysis, only tumor DLL3 expression remained statistically significant (HR: 0.41; 95%CI: 0.23–0.71; p = 0.02) (Table 3). Here, DLL3 is linked to neoplasm.