UBD and gastric cancer: By using TCGA database analysis, we found that high expression of CRABP2 (OS, p = 3.5e‐08; PFS, p = 8.8e‐13), OSMR (OS, p = 0.00014; PFS, p = 0.00031) (PCs, Figure 2I and Figure S4G), LEFTY1 (OS, p = 0.048), UBD (OS, p = 0.015) (MSCs, Figure 2J), MSLN (OS, p = 0.0066), and XIST (OS, p = 0.00015) (PMC‐like, Figure 2K) was associated with poor prognosis in GC patients.