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Int. J. Mol. Sci. 2019, 20(4), 824;

Role of PD-L1 Expression in Non-Small Cell Lung Cancer and Their Prognostic Significance according to Clinicopathological Factors and Diagnostic Markers

Department of Thoracic Surgery, Wroclaw Medical University, Wroclaw 53-439, Poland
Department of Thoracic Surgery, Lower Silesian Centre of Lung Diseases, Wroclaw 53-439, Poland
Department of Human Morphology and Embryology, Wroclaw Medical University, Wroclaw 50-368, Poland
Department of Physiotherapy, Wroclaw University School of Physical Education, Wroclaw 51-612, Poland
Author to whom correspondence should be addressed.
Received: 25 January 2019 / Revised: 10 February 2019 / Accepted: 12 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue PD-L1, A Master Regulator of Immunity)
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Background: The latest immunotherapy, used in the treatment of non-small cell lung cancer (NSCLC), uses monoclonal antibodies directed against programmed death ligand 1 (PD-L1) to inhibit its interaction with the PD-1 receptor. Elevated levels of PD-L1 expression were observed on NSCLC cells. The association between PD-L1 expression and clinicopathological features is still unclear. Therefore, we examined this relationship and also compare PD-L1 expression levels with Ki-67, p63 and TTF-1. Methods: 866 samples of NSCLCs were used to prepare tissue microarrays (TMAs) on which immunohistochemical (IHC) reactions were performed. Changes in the level of CD274 (PD-L1) gene expression in 62 NSCLC tumors were tested in relation to 14 normal lung tissues by real-time PCR reactions (RT-PCR). Results: PD-L1 expression was observed in 32.6% of NSCLCs. PD-L1 expression was increased in higher malignancy grades (G) (p < 0.0001) and in higher lymph node status (pN) (p = 0.0428). The patients with low PD-L1 expression had longer overall survival compared to the group with high expression (p = 0.0332) in adenocarcinoma (AC) only. Conclusions: PD-L1 expression seems to be associated with increased tumor proliferation and aggressiveness as well as shorter patient survival in NSCLC, predominantly in the AC group. View Full-Text
Keywords: PD-L1; Ki-67; TTF-1; p63; non-small cell lung cancer PD-L1; Ki-67; TTF-1; p63; non-small cell lung cancer

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Pawelczyk, K.; Piotrowska, A.; Ciesielska, U.; Jablonska, K.; Glatzel-Plucinska, N.; Grzegrzolka, J.; Podhorska-Okolow, M.; Dziegiel, P.; Nowinska, K. Role of PD-L1 Expression in Non-Small Cell Lung Cancer and Their Prognostic Significance according to Clinicopathological Factors and Diagnostic Markers. Int. J. Mol. Sci. 2019, 20, 824.

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