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Published in: Annals of Surgical Oncology 3/2019

01-03-2019 | Translational Research and Biomarkers

Soluble PD-L1 Expression in Circulation as a Predictive Marker for Recurrence and Prognosis in Gastric Cancer: Direct Comparison of the Clinical Burden Between Tissue and Serum PD-L1 Expression

Authors: Tsunehiko Shigemori, MD, Yuji Toiyama, MD, PhD, FACS, Yoshinaga Okugawa, MD, PhD, Akira Yamamoto, MD, Chengzeng Yin, MD, Aya Narumi, MD, Takashi Ichikawa, MD, Shozo Ide, MD, PhD, Tadanobu Shimura, MD, PhD, Hiroyuki Fujikawa, MD, PhD, Hiromi Yasuda, MD, PhD, Junichiro Hiro, MD, PhD, Shigeyuki Yoshiyama, MD, PhD, Masaki Ohi, MD, PhD, Toshimitsu Araki, MD, PhD, Masato Kusunoki, MD, PhD

Published in: Annals of Surgical Oncology | Issue 3/2019

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Abstract

Background

This study assessed programmed cell death ligand 1 (PD-L1) expression in primary tissues and soluble PD-L1 (sPD-L1) concentration in matched preoperative serum in gastric cancer (GC) patients to perform direct comparison between tissue and serum PD-L1 expression and to clarify the prognostic implication in GC.

Methods

The study enrolled 180 GC patients who underwent surgery for GC at the authors’ institution. The study evaluated tissue PD-L1 expression using immunohistochemistry and quantified sPD-L1 concentration in preoperative serum using enzyme-linked immunosorbent assay in GC patients.

Results

The findings showed that PD-L1 was overexpressed in GC tissues compared with normal mucosa. Tissue PD-L1 expression was significantly higher in the GC patients with advanced T stage, presence of lympho-vascular invasion, lymph node metastasis, and peritoneal metastasis. Furthermore, elevated tissue PD-L1 expression was significantly associated with poor prognosis for overall survival (OS) and disease-free survival (DFS). Serum sPD-L1 was significantly higher in the GC patients than in the healthy volunteers. Although serum sPD-L1 was not correlated with any clinicopathologic factors, the patients with high serum sPD-L1 showed poorer OS and DFS than those with low sPD-L1. Multivariate analyses showed that both elevated tissue PD-L1 and serum sPD-L1 were independent prognostic factors for poor OS [tissue PD-L1: hazard ratio (HR), 4.28; 95% confidence interval (CI), 1.43–12.8; P = 0.0094 vs. serum sPD-L1: HR, 11.2; 95% CI, 3.44–36.7; P = 0.0001] and poor DFS (tissue PD-L1: HR, 6.96; 95% CI, 2.48–19.6; P = 0.0002 vs. serum sPD-L1: HR, 8.7; 95% CI, 3.16–23.9; P < 0.0001) for the GC patients. Furthermore, infiltrative CD8- and Foxp3-positive T cells were significantly increased in the GC patients with elevated tissue PD-L1 expression.

Conclusion

Both serum sPD-L1 and tissue PD-L1 expression may serve as predictive biomarkers for recurrence and prognosis in GC patients.
Appendix
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Metadata
Title
Soluble PD-L1 Expression in Circulation as a Predictive Marker for Recurrence and Prognosis in Gastric Cancer: Direct Comparison of the Clinical Burden Between Tissue and Serum PD-L1 Expression
Authors
Tsunehiko Shigemori, MD
Yuji Toiyama, MD, PhD, FACS
Yoshinaga Okugawa, MD, PhD
Akira Yamamoto, MD
Chengzeng Yin, MD
Aya Narumi, MD
Takashi Ichikawa, MD
Shozo Ide, MD, PhD
Tadanobu Shimura, MD, PhD
Hiroyuki Fujikawa, MD, PhD
Hiromi Yasuda, MD, PhD
Junichiro Hiro, MD, PhD
Shigeyuki Yoshiyama, MD, PhD
Masaki Ohi, MD, PhD
Toshimitsu Araki, MD, PhD
Masato Kusunoki, MD, PhD
Publication date
01-03-2019
Publisher
Springer International Publishing
Published in
Annals of Surgical Oncology / Issue 3/2019
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-018-07112-x

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