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Exploratory study of macrophage polarization and spatial distribution in colorectal cancer liver metastasis: a pilot study
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Exploratory study of macrophage polarization and spatial distribution in colorectal cancer liver metastasis: a pilot study
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Journal Article
Exploratory study of macrophage polarization and spatial distribution in colorectal cancer liver metastasis: a pilot study
2023
Overview
BackgroundThe liver is the most typical site of metastatic disease for patients with colorectal cancer (CRC), and up to half the patients with CRC will develop colorectal liver metastasis (CLM). Studying the tumor microenvironment, particularly macrophages and their spatial distribution, can give us critical insight into treatment.MethodsTen CLMs (five treatment-naïve and five post–neoadjuvant chemotherapy) were stained with multiplex immunofluorescence panels against cytokeratins, CD68, Arg1, CD206, CD86, CD163, PD-L1, and MRP8-14. Densities of cell phenotypes and their spatial distribution in the tumor center and the normal liver–tumor interface were correlated with clinicopathological variables.ResultsM2 macrophages were the predominant subtype in both the tumor center and the periphery, with a relatively higher density at the periphery. The larger tumors, more than 3.9 cm, were associated with higher densities of total CD68+ macrophages and CD68+CD163+ CD206neg and CD68+CD206+ CD163neg M2 macrophage subtypes. Total macrophages in the tumor periphery demonstrated significantly greater proximity to malignant cells than did those in the tumor center (p=0.0371). The presence of higher than median CD68+MRP8-14+CD86neg M1 macrophages in the tumor center was associated with poor overall survival (median 2.34 years) compared to cases with lower than median M1 macrophages at the tumor center (median 6.41 years) in univariate analysis.ConclusionThe dominant polarization of the M2 macrophage subtype could drive new therapeutic approaches in CLM patients.
