PDCD1 and malignant colon neoplasm: Further exploration of the association of UVRAG expression and expressions of PD-1, PD-L1, and PD-L2 in different tumor locations indicated that all of the above-mentioned markers were positively associated with UVRAG expression in colon cancer (Table 3), while only PD-L2 expression showed a correlation with UVRAG expression in rectal cancer (Table 4).