TY - JOUR T1 - Prognostic significance of PD-1 and PD-L1 positive tumor-infiltrating immune cells in ovarian carcinoma JF - International Journal of Gynecologic Cancer JO - Int J Gynecol Cancer SP - 1389 LP - 1395 DO - 10.1136/ijgc-2019-000609 VL - 29 IS - 9 AU - Paul Buderath AU - Fabian Mairinger AU - Elena Mairinger AU - Katharina Böhm AU - Pawel Mach AU - Kurt Werner Schmid AU - Rainer Kimmig AU - Sabine Kasimir-Bauer AU - Agnes Bankfalvi AU - Daniela Westerwick AU - Thomas Hager Y1 - 2019/11/01 UR - http://ijgc.bmj.com/content/29/9/1389.abstract N2 - Introduction Ovarian carcinoma is associated with the highest mortality of all gynecologic malignancies. Even after optimal treatment, prognosis remains poor. There is no established biomarker to predict individual patient outcome.Objective To evaluate the prognostic significance of PD-1 and PD-L1 expression in tumor tissues from patients with ovarian cancer.Methods Tissue micro-arrays were prepared from routinely formalin-fixed, paraffin-embedded tumor tissues and examined immunohistochemically for the expression of programed cell death protein 1 (PD-1) and one of its ligands (PD-L1) on epithelial tumor cells, as well as on tumor- and stroma-infiltrating immune cells.Results The presence of PD-1 positive tumor-infiltrating immune cells was significantly associated with prolonged overall survival. PD-1 and PD-L1 positive tumor-infiltrating immune cells were associated with the presence of lymph node metastases and higher tumor grade. Interestingly, the amount of PD-1/PD-L1 positive tumor- and stroma-infiltrating immune cells independent of PD-1 or PD-L1 expression did not show any significant correlation with prognostic variables.Conclusion Our results highlight the prognostic value of PD-1 and PD-L1 positive tumor-infiltrating immune cells in ovarian carcinoma. Their association with favorable prognosis supports the hypothesis that the expression of PD-1 and PD-L1 on tumor-infiltrating immune cells represents a strong immune response. ER -