PDCD1 and neoplasm: Tumor infiltrating B lymphocytes as well as CD8 positive (CD8+) T lymphocytes and dendritic cells correlated inversely with PD-1 (r = − 0.178; p < 0.001 for B lymphocytes, r = − 0.234; p < 0.001 for CD8+ T lymphocytes, and r = − 0.171; p < 0.031 for dendritic cells, n = 419 for all).