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CD8+ tumor-infiltrating lymphocytes as a novel prognostic biomarker in lung sarcomatoid carcinoma, a rare subtype of lung cancer

Authors Chen J, He Q, Liu J, Xiao Y, Xiao C, Chen K, Xie D, Zhang X

Received 6 April 2018

Accepted for publication 5 June 2018

Published 13 September 2018 Volume 2018:10 Pages 3505—3511


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Professor Lu-Zhe Sun

Jiewei Chen,1,2,* Qingmei He,2,* Jun Liu,1,2,* Yongbo Xiao,1 Canhua Xiao,3 Keming Chen,1 Dan Xie,1,2 Xinke Zhang1,2

1Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, People’s Republic of China; 2Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, 510060, People’s Republic of China; 3Department of Pathology, Qingyuan People’s Hospital, Qingyuan, 511581, People’s Republic of China

*These authors contributed equally to this work

Purpose: The aim of this study was to investigate the degree of infiltration of CD8+ tumor-infiltrating lymphocytes (TILs) including high and low density in lung sarcomatoid carcinoma (LSC) and their clinicopathological significance.
Patients and methods: The density of CD8+ TILs in paraffin-embedded tissue sections from 100 LSC patients was detected by immunohistochemical staining, and the relationship of CD8+ TILs with clinicopathological features and prognosis was analyzed.
Results: The chi-squared test showed that the degree of infiltration of CD8+ TILs was significantly correlated with the clinicopathological stage and T stage of LSC (P<0.05). The univariate analysis demonstrated that tumor size, clinicopathological stage, T stage, N stage, M stage, and CD8+ TILs are risk factors that affect prognosis of the patients (P<0.05). The mean overall survival (OS) of LSC patients with a high density of CD8+ TILs was 92.3 months, which was significantly higher than 31.2 months in patients with a low density of CD8+ TILs (P<0.05). Cox regression multivariate analysis confirmed that the density of CD8+ TILs was an independent prognostic factor for OS time of LSC patients (hazard ratio=0.455, P<0.05).
Conclusion: CD8+ TILs could be used as an effective prognostic index for LSC patients, and a high density of CD8+ TILs in tumor tissue may predict a better outcome.

Keywords: lung sarcomatoid carcinoma, CD8+ TILs, immunohistochemistry, prognosis

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