PVR and gastric cancer: The statistical analysis of the relationship between CD155 expression and clinicopathological features revealed that CD155 expression was significantly correlated with the tumor volume (r = 0.183, P = 0.003), tumor stage (r = 0.128, P = 0.037) and lymph node metastasis (r = 0.151, P = 0.013, Table 1), which also indicated that CD155 might be involved in tumor progression in gastric cancer.