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Clinicopathological analysis of PD-L2 expression in colorectal cancer

Authors Guo PD, Sun ZW, Lai HJ, Yang J, Wu PP, Guo YD, Sun J

Received 15 June 2018

Accepted for publication 15 August 2018

Published 1 November 2018 Volume 2018:11 Pages 7635—7642


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Sanjeev Srivastava

Peng-Da Guo,1,* Zhong-Wen Sun,1,* Hui-Jun Lai,2 Jie Yang,1 Ping-Ping Wu,1 Yun-Di Guo,1 Jing Sun1

1Institute of Medical Technology, Suzhou Vocational Health College, Suzhou, Jiangsu 215009, China; 2Department of Ultrasound, Suzhou Traditional Chinese Medicine, Suzhou, Jiangsu 215007, China

*These authors contributed equally to this work

Background: (PD-L2), a ligand of programmed cell death protein 1 (PD-1), is an inhibitory receptor of T cells and activated B cells. Many studies have focused on PD-L1, another ligand of PD-1, and the prognostic significance of PD-L1 has been reported in many tumors. However, the expression of PD-L2 in relation to clinical outcomes has not been fully investigated in cancer patients.
Patients and methods: In this study, we investigated the expression of PD-L2 via immunohistochemistry (IHC) in the pathological specimens of 348 patients treated for colorectal cancer (CRC).
Results: Strong PD-L2 expression was found in the cancer tissues from 41% of the CRC patients who also had a high TNM stage and carcinoembryonic antigen (CEA) concentration. We also carried out functional studies in vitro, which showed that PD-L2 did not influence the growth of the CRC cell line HCT116, but increased cell invasion.
Conclusion: Collectively, these findings suggest that PD-L2 may be a potential therapeutic target for CRC.

Keywords: PD-L2, colorectal cancer, migration, therapeutic target

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