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Published in: Journal of Ovarian Research 1/2018

Open Access 01-12-2018 | Research

Stratification of ovarian tumor pathology by expression of programmed cell death-1 (PD-1) and PD-ligand- 1 (PD-L1) in ovarian cancer

Authors: Maureen L. Drakes, Swati Mehrotra, Monica Aldulescu, Ronald K. Potkul, Yueying Liu, Anne Grisoli, Cara Joyce, Timothy E. O’Brien, M. Sharon Stack, Patrick J. Stiff

Published in: Journal of Ovarian Research | Issue 1/2018

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Abstract

Background

Ovarian cancer is the major cause of death among gynecologic cancers with 75% of patients diagnosed with advanced disease, and only 20% of these patients having a survival duration of five years. Treatments blocking immune checkpoint molecules, programmed cell death (PD-1) or its ligand PD-ligand- I (PD-L1) have produced a beneficial and prolonged effect in a subgroup of these patients. However, there is debate in the literature concerning the prognostic value of the expression of these molecules in tumors, with immunotherapy responsiveness, and survival.
We evaluated the immune landscape of the ovarian tumor microenvironment of patients, by measuring the impact of the expression of tumor PD-1, PD-L1 and infiltrating lymphocytes on stage and grade of tumors and survival, in a cohort of 55 patients with gynecologic malignancies. Most patients under study were diagnosed with advanced disease ovarian cancer.

Results

Our studies revealed that a low density of PD-1 and of PD-L1 expressing cells in tumor tissue were significantly associated with advanced disease (P = 0.028 and P = 0.033, respectively). Moreover, PD-L1 was expressed significantly more often in high grade tumors (41.5%) than in low grade tumors of patients (7.7%) (P = 0.040). The presence of CD3 or of FoxP3 infiltrating cells with PD-L1 in patient tumors did not impact the significance of the association of PD-L1 with high grade tumors (P = 0.040), and our analyses did not show an association between the presence of PD-1 or PD-L1 and survival.

Conclusions

We conclude that a subgroup of advanced disease ovarian cancer patients with high grade tumors, expressing PD-L1, may be prime candidates for immunotherapy targeting PD-1 signaling.
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Metadata
Title
Stratification of ovarian tumor pathology by expression of programmed cell death-1 (PD-1) and PD-ligand- 1 (PD-L1) in ovarian cancer
Authors
Maureen L. Drakes
Swati Mehrotra
Monica Aldulescu
Ronald K. Potkul
Yueying Liu
Anne Grisoli
Cara Joyce
Timothy E. O’Brien
M. Sharon Stack
Patrick J. Stiff
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of Ovarian Research / Issue 1/2018
Electronic ISSN: 1757-2215
DOI
https://doi.org/10.1186/s13048-018-0414-z

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