Abstract
Background
Tumor PD-L1 expression is a predictive biomarker for patients with NSCLC receiving PD-(L)1 blockade agents. However, although increased tumor PD-L1 expression predicts responsiveness, clinical benefit has been observed regardless of tumor PD-L1 expression, suggesting the existence of other PD-L1 sources. The aim of our study was to analyze whether integrating systemic and tumor PD-L1 is more predictive of efficacy in patients with advanced NSCLC receiving PD-(L)1 blockade agents.
Material and methods
Twenty-nine healthy donors and 119 consecutive patients with advanced NSCLC treated with PD-(L)1 drug were prospectively included. Pretreatment blood samples were collected to evaluate PD-L1 levels on circulating immune cells, platelets (PLTs), platelet microparticles (PMPs), and the plasma soluble PD-L1 concentration (sPD-L1). Tumor PD-L1 status was assessed by immunohistochemistry. The percentages of circulating PD-L1 + leukocytes, sPD-L1 levels, and tumor PD-L1 were correlated with efficacy.
Results
No differences in the percentages of circulating PD-L1 + leukocytes were observed according to tumor PD-L1 expression. Significantly longer progression-free survival was observed in patients with higher percentages of PD-L1 + CD14 + , PD-L1 + neutrophils, PD-L1 + PLTs, and PD-L1 + PMPs and significantly longer overall survival was observed in patients with higher percentages of PD-L1 + CD14 + and high tumor PD-L1 expression. Integrating the PD-L1 data of circulating and tumor PD-L1 results significantly stratified patients according to the efficacy of PD-(L1) blockade agents.
Conclusions
Our results suggest that integrating circulating PD-L1 + leukocytes, PLT, PMPs, and sPD-L1 and tumor PD-L1 expression may be helpful to decide on the best treatment strategy in patients with advanced NSCLC who are candidates for PD-(L)1 blockade agents.
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Abbreviations
- CH:
-
Chemotherapy
- CI:
-
Confidence interval
- ECOG PS:
-
Eastern Cooperative Oncology Group performance status
- FITC:
-
Fluorescein
- HD:
-
Healthy donors
- HR:
-
Hazard Ratio
- IO:
-
Immunotherapy
- IPD:
-
Integrated PD-L1 data
- irAEs:
-
Immune-related adverse events
- IHC:
-
Immunohistochemistry
- iRECIST:
-
Immune-Response Evaluation Criteria In Solid Tumors
- NSCLC:
-
Non-small cell lung cancer
- PD-1:
-
Programmed death-1
- PD-L1:
-
Programmed death-ligand 1
- PLTs:
-
Platelets
- PMPs:
-
Platelet microparticles
- sPD-L1:
-
Plasma concentrations of soluble PD-L1
- OS:
-
Overall survival
- PFS:
-
Progression-free-survival
- TPS:
-
Tumor proportion score
- RECIST:
-
Response Evaluation Criteria in Solid Tumors
- NE:
-
Not evaluable
- PE:
-
Phycoerythrin
- PECy7:
-
Phycoerythrin Cyanine 7
- PECy5:
-
Phycoerythrin Cyanine 5
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Acknowledgments
SV was supported by “Fondo Investigaciones Sanitarias” and a participant in the Program for the Stabilization of Investigators from the “Direcció i d’Estrategia I Coordinació del Departament Salut de la Generalitat de Catalunya.”
Funding
This work was supported by the Bristol Myers Squibb.
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All authors were involved in revising intellectual content, and all authors approved the final version for publication. CZ, MM, LA, and MAO performed cellular staining and flow cytometry analysis and ELISAs. CZ and MM and MAO analyzed results of flow cytometry and ELISAS; GA, MR, IS, AB, JS, OG, JG, and MM collected samples and clinical data; CZ and SV performed statistical analysis.GA, CZ, MM and SV wrote the manuscript. MM, and SV designed the study.
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The study was conducted in accordance with the Helsinki Declaration and approved by the Research Ethics Board of Hospital de la Santa Creu I Sant Pau, Barcelona (IIBSP-PDL-2017–82).
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Zamora Atenza, C., Anguera, G., Riudavets Melià, M. et al. The integration of systemic and tumor PD-L1 as a predictive biomarker of clinical outcomes in patients with advanced NSCLC treated with PD-(L)1blockade agents. Cancer Immunol Immunother 71, 1823–1835 (2022). https://doi.org/10.1007/s00262-021-03107-y
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DOI: https://doi.org/10.1007/s00262-021-03107-y