Abstract
The combined positive score (CPS) and tumor proportion score (TPS) have been developed to evaluate programmed death ligand-1 (PD-L1) expression, especially due to the potential benefit of the targeted therapy. However, the prognostic value of PD-L1 scoring systems in gastric cancer (GC) remains unclear. This study aimed to evaluate PD-L1 expression according to CPS and TPS in curative resected GC patients and its correlation with prognosis. We retrospectively evaluated 284 GC patients who underwent D2-gastrectomy by tissue microarray. PD-L1 expression was analyzed by immunohistochemistry. PD-L1 positivity by CPS and TPS was observed in 45 (15.8%) and 34 (12%) patients, respectively. Larger tumor size (p = 0.028), undetermined Lauren type (p < 0.001), and heavy inflammatory infiltrate (p = 0.009) were associated with CPS-positive GC. TPS-positive were more frequent in patients with larger tumor size (p = 0.004), undetermined type (p < 0.001), moderate/severe inflammatory infiltrate (p = 0.001), total gastrectomy (p = 0.036), and poorly differentiated histology (p = 0.025). No differences were observed in the pT, pN, and pTNM status according to the PD-L1 scores. Both scores were associated with Epstein-Barr virus positivity, microsatellite instability and p53-normal expression. The disease-free survival (DFS) was worse for CPS-negative compared to CPS-positive group (p = 0.052). No difference was observed between TPS-positive and negative groups (p = 0.436). Total gastrectomy, advanced pT status, and CPS-negative were independent factor for worse survival in GC. CPS was an independent prognostic factor for survival and could be used as a prognostic biomarker in patients with resectable GC.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP agency) – grant number 2016/25524-0.
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Marina A. Pereira and Tiago Biachi de Castria: study design, data retrieval, critical analysis, and draft of the manuscript. Marcus F.K.P. Ramos: data retrieval, critical analysis, and review of the manuscript. Andre R. Dias: data retrieval and review of the manuscript. Marina A. Pereira, Renan R. Ribeiro, Leonardo Cardili, and Evandro S. Mello: laboratory techniques and pathological analysis. Ulysses Ribeiro Jr, Bruno Zilberstein, and Ivan Cecconello: implementation of the research, critical analysis, and reviews of the manuscript.
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Pereira, M.A., Ramos, M.F.K.P., Dias, A.R. et al. Scoring systems for PD-L1 expression and their prognostic impact in patients with resectable gastric cancer. Virchows Arch 478, 1039–1048 (2021). https://doi.org/10.1007/s00428-020-02956-9
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DOI: https://doi.org/10.1007/s00428-020-02956-9