In case of digestive system cancer, OS of the patients with high expression of CD155 was reported to be significantly lower as compared to the patients with low expression of CD155 (pooled HR = 1.570, 95% CI = 1.120–2.201, P = 0.009), and significant correlation was also obtained in hepatobiliary pancreatic cancer (pooled HR = 1.677, 95% CI = 1.037–2.712, P = 0.035) and digestive tract cancer (pooled HR = 1.512, 95% CI = 1.016–2.250, P = 0.042). Here, PVR is linked to digestive system cancer.