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• W2279684443 abstract "Background Programmed cell death-ligand 1 (PD-L1) is expressed in a subgroup of lung cancer that may benefit from immunotherapy. The interaction between PD-L1 expression and tumour infiltrating lymphocytes (TIL) remains poorly understood. This study investigated the expression of PD-L1 in surgically resected stage I pulmonary squamous cell carcinoma (SqCC) and correlated it with TILs in tumour microenvironments, common driver mutations, and clinical outcomes. Materials and methods One hundred and five patients with surgically resected stage I squamous cell carcinoma were examined. Paraffin-embedded tumour sections were stained with PD-L1 antibody. Tumours with moderate-to-strong membrane staining in ≥5% of tumour cells were scored as positive for PD-L1 expression. The driver mutation epidermal growth factor receptor (EGFR), Kirsten rat sarcoma viral oncogene homolog (KRAS), and v-raf murine sarcoma viral oncogene homolog B (BRAF) were examined by direct sequencing, while anaplastic lymphoma kinase (ALK), phosphoinositide 3-kinase catalytic alpha (PI3KCA), and fibroblast growth factor receptor 1 (FGFR1) were analysed by immunohistochemistry. The correlations of PD-L1 expression with each subtype of TIL, driver mutations, clinicopathologic parameters, and clinical outcomes were analysed. Results There was positive PD-L1 expression in 56.2% (59/105) of patients. PD-L1 expression was not associated with the common clinicopathologic features and mutations of EGFR, KRAS, BRAF, ALK, PI3KCA, and FGFR1. As regards TILs composition, tumour PD-L1 expression was significantly associated with increased tumour epithelial CD8+ T cells and stromal CD4+ T cells. Otherwise, PD-L1 (+) tumour cells were negatively correlated with PD-L1 (+) immune cells within tumour stroma. By multivariate analysis, tumour PD-L1 expression and increased CD4+ T cell infiltrations in the tumour stroma were independent predictors of better overall survival and had a trend of better disease-free survival. Conclusions PD-L1 expression is associated with a favourable immune microenvironment in stage I pulmonary SqCC and correlates with better clinical outcome." @default.
• W2279684443 created "2016-06-24" @default.
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• W2279684443 date "2016-04-01" @default.
• W2279684443 modified "2023-10-17" @default.
• W2279684443 title "Programmed cell death-ligand 1 expression is associated with a favourable immune microenvironment and better overall survival in stage I pulmonary squamous cell carcinoma" @default.
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• W2279684443 doi "https://doi.org/10.1016/j.ejca.2015.12.033" @default.
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