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ORIGINAL ARTICLE
Year : 2019  |  Volume : 15  |  Issue : 4  |  Page : 914-920

mRNA expression of programmed cell death ligand 1 and components of the phosphatidylinositol 3-kinase/AKT/phosphatase and tensin homolog pathway in epidermal growth factor receptor mutation-positive lung adenocarcinoma


Department of Thoracic Surgery, Xuan Wu Hospital of Capital Medical University, Beijing 100053, China

Correspondence Address:
Yi Zhang
Department of Thoracic Surgery, Xuan Wu Hospital of Capital Medical University, Beijing 100053
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jcrt.JCRT_636_18

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Objective: The objective of this study is to investigate the relationship between programmed cell death ligand 1 (PD-L1) expression and the mutation status of epidermal growth factor receptor (EGFR) in lung adenocarcinoma, as well as the correlation between the clinical features of patients and mRNA levels of PD-L1 and components of the phosphatidylinositol 3-kinase (PI3K)/ protein kinase B (AKT)/phosphatase and tensin homolog (PTEN) pathways. Methods: mRNA levels of PD-L1, PI3K, AKT, and PTEN in tumor and matched normal tissues of patients with EGFR mutation-positive lung adenocarcinoma were determined by real-time polymerase chain reaction. Results: Twenty-three patients with EGFR mutation-positive lung adenocarcinoma were enrolled, and 46 samples (23 pairs of tumor and matched normal lung tissues) were collected. PD-L1 and AKT mRNA levels were higher in EGFR mutation-positive lung adenocarcinoma than in matched normal lung tissues (P = 0.047 and P = 0.046, respectively), whereas PI3K and PTEN mRNA levels were significantly lower in the cancerous tissues (P = 0.009 and P = 0.039, respectively). PD-L1 expression was positively correlated with PI3K/AKT signaling pathway activation. PD-L1 upregulation in lung adenocarcinoma was positively correlated with EGFR exon 19 mutations (P = 0.034). AKT mRNA upregulation was correlated with lymph node metastasis (P = 0.034). PTEN mRNA downregulation was correlated with high tumor staging and lymph node metastasis (P = 0.035 and P = 0.014, respectively). Conclusion: Elevated PD-L1 mRNA expression in lung adenocarcinoma is associated with EGFR mutation and may be mediated through the PI3K-AKT pathway. EGFR exon 19 mutations closely correlate with increased PD-L1 mRNA expression. Increased AKT mRNA expression correlates with lymph node metastasis, while decreased PTEN mRNA levels correlate with advanced tumor stage and lymph node metastasis.


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