They reported that high expression of PD-L1 was observed in 5% of the tumor cells, whereas PD-1 exhibited high expression in 19% of tumor-infiltrating lymphocytes, and in their analysis, PD-L1 expression in tumor cells was confirmed as a poor prognostic factor for recurrence-free survival, while PD-1 expression in tumor-infiltrating lymphocytes was identified as a favorable prognostic factor. Here, PDCD1 is linked to neoplasm.