CD274 and neoplasm: We additionally quantified the percentages of tumor cells expressing PD-L1 (PD-L1 expressing in tumor cells [Tum]), B7-H3 (B7-H3 Tum), and B7-H4 (B7-H3 Tum); the percentages of tumor-infiltrating immune cells expressing PD-L1 (PD-L1 expressing in tumor-infiltrating immune cells [Tii]), B7-H3 (B7-H3 Tii), and B7-H4 (B7-H4 Tii); and the percentages of peritumoral and tumor stroma infiltrated by CD8-positive lymphocytes (CD8) or CD68-positive macrophages (CD68).