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Cytokine-induced killer cells/dendritic cells and cytokine-induced killer cells immunotherapy for the treatment of esophageal cancer in China: a meta-analysis

Authors Liu Y, Mu Y, Zhang A, Ren SD, Wang WH, Xie JP, Zhang YX, Zhou CH

Received 17 January 2017

Accepted for publication 14 March 2017

Published 29 March 2017 Volume 2017:10 Pages 1897—1908

DOI https://doi.org/10.2147/OTT.S132507

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Akshita Wason

Peer reviewer comments 2

Editor who approved publication: Dr William Cho

Yan Liu,1,* Ying Mu,2,* Anqi Zhang,3 Shaoda Ren,3 Weihua Wang,3 Jiaping Xie,2 Yingxin Zhang,3 Changhui Zhou3

1Department of Gastroenterology, Weifang People’s Hospital, Weifang, 2Department of Gastroenterology, 3Central Laboratory, Liaocheng People’s Hospital, Liaocheng Clinical School of Taishan Medical University, Liaocheng, Shandong Province, People’s Republic of China

*These authors contributed equally to this work

Background: Immunotherapy based on cytokine-induced killer cells or combination of dendritic cells and cytokine-induced killer cells (CIK/DC-CIK) showed promising clinical outcomes for treating esophageal cancer (EC). However, the clinical benefit varies among previous studies. Therefore, it is necessary to systematically evaluate the curative efficacy and safety of CIK/DC-CIK immunotherapy as an adjuvant therapy for conventional therapeutic strategies in the treatment of EC.
Materials and methods: Clinical trials published before October 2016 and reporting CIK/DC-CIK immunotherapy treatment responses or safety for EC were searched in Cochrane Library, EMBASE, PubMed, Wanfang and China National Knowledge Internet databases. Research quality and heterogeneity were evaluated before analysis, and pooled analyses were performed using random- or fixed-effect models.
Results:
This research covered 11 trials including 994 EC patients. Results of this meta-analysis indicated that compared with conventional therapy, the combination of conventional therapy with CIK/DC-CIK immunotherapy significantly prolonged the 1-year overall survival (OS) rate, overall response rate (ORR) and disease control rate (DCR) (1-year OS: P=0.0005; ORR and DCR: P<0.00001). Patients with combination therapy also showed significantly improved quality of life (QoL) (P=0.02). After CIK/DC-CIK immunotherapy, lymphocyte percentages of CD3+ and CD3CD56+ subsets (P<0.01) and cytokines levels of IFN-γ, -2, TNF-α and IL-12 (P<0.00001) were significantly increased, and the percentage of cluster of differentiation (CD)4+CD25+CD127 subset was significantly decreased, whereas analysis of CD4+, CD8+, CD4+/CD8+ and CD3+CD56+ did not show significant difference (P>0.05).
Conclusion: The combination of CIK/DC-CIK immunotherapy and conventional therapy is safe and markedly prolongs survival time, enhances immune function and improves the treatment efficacy for EC.

Keywords:
cytokine-induced killer cells, dendritic cells, esophageal cancer, immunotherapy, meta-analysis

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