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Tumor-associated macrophage infiltration and prognosis in colorectal cancer: systematic review and meta-analysis

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Background

Tumor-associated macrophages (TAMs) are key components of colorectal cancer (CRC) microenvironment, but their role in CRC prognosis is not fully defined.

Objective

This study aimed to evaluate prognostic value of different types and distribution of TAMs in CRC.

Methods

Total 27 studies with 6115 patients were searched from PubMed and Embase and analyzed to determine the association between TAMs, including distinct TAM subsets and infiltration location, and CRC survival. The prognostic impact of TAMs on CRC was further stratified by tumor type and mismatch repair system (MMR) status.

Results

A pooled analysis indicated that high density of TAMs in CRC tissue was significantly associated with favorable 5-year overall survival (OS) but not with disease-free survival (DFS). CD 68+ TAM subset correlated with better 5-year OS, while neither CD68+NOS2+ M1 subset nor CD163+ M2 subset was correlated with 5-year OS. Increased CD68+ TAM infiltration in tumor stroma but not in tumor islet predicted improved 5-year OS. Stratification by tumor type and MMR status showed that in colon cancer or MMR-proficient CRC, elevated TAM density was associated with better 5-year OS.

Conclusions

High infiltration of CD68+ TAMs could be a favorable prognostic marker in CRC. Future therapies stimulating CD68+ TAM infiltration may be promising in CRC treatment.

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Data availability

All data are available upon request.

Abbreviations

CI:

confidence interval

CRC:

colorectal cancer

DFS:

disease-free survival

HE:

hematoxylin-eosin

HR:

hazard ratio

IHC:

immunohistochemistry

MMR:

mismatch repair system

NOS:

Newcastle-Ottawa Scale

NOS2:

nitric oxide synthase 2

OS:

overall survival

TAMs:

tumor-associated macrophages

TI:

tumor islet

TS:

tumor stroma

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Acknowledgments

This project was supported by the Innovation Commission of Kunming University of Science and Technology (No. KKSY 201860009) and Foundation of Yunnan Provincial Science and Technology (Nos. 2017NS208, 2018NS0232, 2018NS0231).

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Jinyuan Li, Linhai Li, Yuejin Li, Yaxin Long, Yiming Ouyang, Quan Zhao, and Weimin Bao collected and analyzed the data. Kunmei Gong designed the study and wrote the manuscript.

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Correspondence to Kunmei Gong.

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Li, J., Li, L., Li, Y. et al. Tumor-associated macrophage infiltration and prognosis in colorectal cancer: systematic review and meta-analysis. Int J Colorectal Dis 35, 1203–1210 (2020). https://doi.org/10.1007/s00384-020-03593-z

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