PDCD1 and metastatic malignant neoplasm in the lymph nodes: In terms of TTR, in the univariate analyses, tumor size (P = 0.006), number (P < 0.001), lymph node metastasis (P < 0.001), TNM stage (P < 0.001), MVI (P = 0.026), and PD-1 (P < 0.001) were found to correlate to TTR.