Furthermore, we found that high tumor expression of PD-L2 was positively correlated with histological type (Pearson's R=0.171 P<0.001), but there was no significant association with other clinicopathologic features, such as age, sex, T classification, N classification, recurrence and metastasis and clinical stage (P>0.05, Table 3). The gene discussed is PDCD1LG2; the disease is neoplasm.