Abstract
Background
Poly (adenosine diphosphate [ADP]-ribose) polymerase inhibitors (PARPis) are becoming the standard of care for epithelial ovarian cancer (EOC). Recently, clinical trials of triple maintenance therapy (PARPi+anti-angiogenic agent+anti-PD-1/L1) are actively ongoing. Here, we investigated the immunological effects of PARPi or triple maintenance therapy on T cells and their impact on clinical responses.
Methods
We collected serial blood from EOC patients receiving PARPi therapy (cohort 1: PARPi, n = 49; cohort 2: olaparib+bevacizumab+pembrolizumab, n = 31). Peripheral T cells were analyzed using flow cytometry and compared according to the PARPi response. Progression-free survival (PFS) was assessed according to prognostic biomarkers identified in a comparative analysis.
Results
Regulatory T cells (Tregs) were suppressed by PARPi therapy, whereas PD-1 was not significantly changed. Short PFS group exhibited a higher percentage of baseline PD-1+Tregs than long PFS group, and the patients with high percentage of PD-1+Tregs before treatment showed poor PFS in cohort 1. However, the expression of PD-1 on Tregs significantly decreased after receiving triple maintenance therapy, and the reduction in PD-1+Tregs was associated with superior PFS in cohort 2 (P = 0.0078).
Conclusion
PARPi suppresses Tregs, but does not affect PD-1 expression. Adding anti-PD-1 to PARPi decreases PD-1+Tregs, which have negative prognostic value for PARPi monotherapy.
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Data availability
The datasets generated and/or analysed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
MSD supported the study by providing the study drugs (olaparib and pembrolizumab). We appreciate all the patients and their families, and all the contributors to this study. We thank MID (Medical Illustration & Design), a part of the Medical Research Support Services of Yonsei University College of Medicine, for providing excellent support with medical illustration.
Funding
This work was supported by grants from the National Research Foundation of the Republic of Korea (NRF-2021R1A2C1093502 to JP), a faculty research grant from Yonsei University College of Medicine (6-2021-0115), and Obstetrics and Gynecology research grant of Yonsei University College of Medicine. The funders had no role in the study design, collection, analysis, and interpretation of the data, writing of the report, and decision to submit the article for publication.
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Conceptualization: J-YL and JP. Data curation: JP. Formal analysis: JP. Funding acquisition: J-YL, JP, and YJL. Investigation: JP and JCK. Methodology: JP, JCK, ML, and JHL. Project administration: J-YL and JP. Resources: J-YL, JP, YJL, SK, and SWK. Software: JP. Supervision: J-YL, YJL, SK, SWK, and S-HP. Validation: J-YL. Visualization: JP. Writing—original draft: JP. Writing—review and editing: J-YL, Y-NK, and YJL. Approval of final manuscript: all authors.
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J-YL reports grants and personal fees from Beigene, Bergenbio, Clovis Oncology, Immunogen, Janssen, Merck, MSD, Novartis, Roche, Seagen, Synthon, and Takeda. All other authors have no conflicts of interest to disclose.
Ethics approval and consent to participate
This study was approved by the Institutional Review Board of Yonsei College of Medicine (cohort 1: 4-2018-0342 and 4-2022-1170; cohort 2: 4-2020-0386). All enrolled patients agreed to participate in the study by providing informed consent. This study was conducted in accordance with the Declaration of Helsinki.
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Park, J., Kim, J.C., Lee, M. et al. Frequency of peripheral PD-1+regulatory T cells is associated with treatment responses to PARP inhibitor maintenance in patients with epithelial ovarian cancer. Br J Cancer 129, 1841–1851 (2023). https://doi.org/10.1038/s41416-023-02455-z
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DOI: https://doi.org/10.1038/s41416-023-02455-z
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