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Tumor-Associated Macrophage Infiltration in Colorectal Cancer Liver Metastases is Associated With Better Outcome

  • Gastrointestinal Oncology
  • Published:
Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Background

Tumor-associated macrophages (TAMs) support growth in most human cancers, with the notable exception of colorectal adenocarcinoma, in which TAM infiltration of primary tumors is correlated with a better outcome. The importance of TAMs in colorectal liver metastases (CLM) is unknown.

Methods

Using a tissue microarray of CLM resected at their institution from 1998 to 2000, the authors quantified immune marker expression by immunohistochemistry (IHC) using Metamorph Image Analysis software. Findings showed that CD68, CD3, CD4, CD8, FoxP3, and MHC-I were correlated with overall survival (OS) and disease-free survival (DFS).

Results

Tumor cores from 158 patients were analyzed. The median follow-up period was 117 months for survivors (n = 39). The univariate analysis showed a significant positive association between DFS and CD4+ (p = 0.025) and CD68+ (p = 0.007). The findings showed a significant positive correlation of OS with CD4+ (p = 0.042), whereas the correlation with CD68+ was not significant (p = 0.17). Cutoffs were determined to dichotimize each marker for the highest log-rank statistic. Patients with CD4high had a median OS of 115 months and DFS of 41 months (p = 0.007 compared with 40 and 16 months, respectively, for patients with CD4low (p = 0.022). Patients with CD68high had a median OS of 50 months and a median DFS of 25 months (p = 0.67) compared with 43 and 15 months (p = 0.028). In the multivariate analysis of factors affecting DFS, high CD68 was associated with longer DFS (hazard ratio [HR], 0.63, 95% confidence interval [CI], 0.43–0.94; p = 0.02), independently of clinicopathologic variables and CD4.

Conclusions

High TAM infiltration in resected CLM is associated with better outcome, independently of known clinicopathologic and immune predictors. This suggests that TAM depletion, which is being tested clinically in other cancers, may be detrimental in CLM.

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Acknowledgments

We thank Irina Linkov from the Pathology Core Facility for performing the IHC, and Yevgeniy Romin from the Molecular Cytology Core Facility for assisting with the digital imaging and automated quantification.

Conflict of interest

There are no conflicts of interest.

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Correspondence to Ronald P. DeMatteo MD.

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Cavnar, M.J., Turcotte, S., Katz, S.C. et al. Tumor-Associated Macrophage Infiltration in Colorectal Cancer Liver Metastases is Associated With Better Outcome. Ann Surg Oncol 24, 1835–1842 (2017). https://doi.org/10.1245/s10434-017-5812-8

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  • DOI: https://doi.org/10.1245/s10434-017-5812-8

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