Samples from patients who underwent surgical resection at the National Cancer Center Hospital, Tokyo, Japan, between January 2002 and July 2019 following no neoadjuvant therapy (n = 55; treatment-naïve), chemotherapy (n = 200), or chemoradiotherapy (CRT; n = 20) were immunohistochemically stained for CD73, CD39, PD-L1, FoxP3, and CD8; markers were quantified across tumor microenvironment (TME) compartments. This evidence concerns the gene CD8A and neoplasm.