A signature of hypoxia-related factors reveals functional dysregulation and robustly predicts clinical outcomes in stage I/II colorectal cancer patients.

Abstract:

Background:The hypoxic tumor microenvironment accelerates the invasion and migration of colorectal cancer (CRC) cells. The aim of this study was to develop and validate a hypoxia gene signature for predicting the outcome in stage I/II CRC patients that have limited therapeutic options. Methods:The hypoxic gene signature (HGS) was constructed using transcriptomic data of 309 CRC patients with complete clinical information from the CIT microarray dataset. A total of 1877 CRC patients with complete prognostic information in six independent datasets were divided into a training cohort and two validation cohorts. Univariate and multivariate analyses were conducted to evaluate the prognostic value of HGS. Results:The HGS consisted of 14 genes, and demarcated the CRC patients into the high- and low-risk groups. In all three cohorts, patients in the high-risk group had significantly worse disease free survival (DFS) compared with those in the low risk group (training cohort-HR = 4.35, 95% CI 2.30-8.23, P < 0.001; TCGA cohort-HR = 2.14, 95% CI 1.09-4.21, P = 0.024; meta-validation cohort-HR = 1.91, 95% CI 1.08-3.39, P = 0.024). Compared to Oncotype DX, HGS showed superior predictive outcome in the training cohort (C-index, 0.80 vs 0.65) and the validation cohort (C-index, 0.70 vs 0.61). Pathway analysis of the high- and low-HGS groups showed significant differences in the expression of genes involved in mTROC1, G2-M, mitosis, oxidative phosphorylation, MYC and PI3K-AKT-mTOR pathways (P < 0.005). Conclusion:Hypoxic gene signature is a satisfactory prognostic model for early stage CRC patients, and the exact biological mechanism needs to be validated further.

journal_name

Cancer Cell Int

authors

Zou YF,Rong YM,Tan YX,Xiao J,Yu ZL,Chen YF,Ke J,Li CH,Chen X,Wu XJ,Lan P,Lin XT,Gao F

doi

10.1186/s12935-019-0964-1

subject

Has Abstract

pub_date

2019-09-23 00:00:00

pages

243

issn

1475-2867

pii

964

journal_volume

19

pub_type

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