Peripheral blood leukocytes show differential expression of tumour progression-related genes in colorectal cancer patients who have a postoperative intra-abdominal infection: a prospective matched cohort study.

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Peripheral blood leukocytes show differential expression of tumour progression-related genes in colorectal cancer patients who have a postoperative intra-abdominal infection: a prospective matched cohort study.

Colorectal Dis. 2017 Feb 18;:

Authors: Alonso S, Mayol X, Nonell L, Salvans S, Pascual M, Pera M, Colorectal Cancer Research Group (Hospital del Mar Medical Research Institute)

Abstract
AIM: Anastomotic leak is associated with higher rates of recurrence after surgery for colorectal cancer. However, the mechanisms responsible are unknown. We hypothesized that the infection-induced inflammatory response may induce overexpression of tumour progression-related genes in immune cells. The aim was to investigate the effect of postoperative intra-abdominal infection on the gene expression patterns of peripheral blood leukocytes (PBL) after surgery for colorectal cancer.
METHODS: Prospective matched cohort study. Patients undergoing surgery for colorectal cancer were included. Patients who had anastomotic leak or intra-abdominal abscess were included in the infection group (n=23), and matched with patients without complications for the control group (n=23). PBL were isolated from postoperative blood samples. Total RNA was extracted and hybridized to the Affymetrix Human Gene 1.0 ST microarray.
RESULTS: Patients in the infection group displayed 162 genes upregulated and 146 genes downregulated respect to the control group. Upregulated genes included examples coding for secreted cytokines involved in tumour growth and invasion (S100P, HGF, MMP8 and 9, PDGFC, IL1R2). Infection also upregulated some proangiogenic genes (CEP55, TRPS1) while downregulated some inhibitors of angiogenesis (MME, ALOX15, CXCL10). Finally, some inhibitors (HP, ORM1, OLFM4, IRAK3) and activators (GNLY, PRF1, FGFBP2) of antitumour immunity were upregulated and downregulated, respectively, suggesting that the inflammatory environment caused by a postoperative infection favour tumour immune evasion mechanisms.
CONCLUSION: Analysis of PBL shows differential expression of certain tumour progression-related genes in colorectal cancer patients having postoperative intra-abdominal infection, which in turn may promote the growth of residual cancer cells to become recurrent tumours. This article is protected by copyright. All rights reserved.

PMID: 28214365 [PubMed - as supplied by publisher]

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