In a separate study,13 PD1 and PD-L1 expression were assessed previously in tumor biospecimens from 349 patients with esophageal squamous cell carcinoma, and PD-L1 expression levels were found to correlate significantly with favorable outcome, whereas PD1 expression within the TME did not show any significant associations with clinicopathologic parameters.13 Here, PDCD1 is linked to neoplasm.