The aim of this study was thus to map the infiltration rate of PD-1 and PD-L1 expressing TILs together with CD8 positive T cells among TILs in EOC, focusing on a comparison of primary ovarian tumor tissue with tissue from metastatic intraperitoneal tumor implants and the respective impact on patients 10 year survival. Here, PDCD1 is linked to ovarian neoplasm.