DLL3 and gastric adenocarcinoma: 3 genes (NOTCH1, NOTCH3, and DLL3) were found significantly correlated with relapse-free survival in STAD, while the remaining 8 genes (NOTCH2, NOTCH4, DLL1, DLL4, JAG1, JAG2, HES1, and HEY1) have no prognostic value (Figure 3).