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2015 ; 6
(21
): 18602-12
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DDX3 as a strongest prognosis marker and its downregulation promotes metastasis
in colorectal cancer
#MMPMID26087195
Su CY
; Lin TC
; Lin YF
; Chen MH
; Lee CH
; Wang HY
; Lee YC
; Liu YP
; Chen CL
; Hsiao M
Oncotarget
2015[Jul]; 6
(21
): 18602-12
PMID26087195
show ga
BACKGROUND: Conflicting results regarding the role of DEAD-box polypeptide 3
(DDX3) are seen not only between cancer types but also within the same type of
cancer. In this study, we aimed at clarifying the prognostic significance of DDX3
in patients of major cancer types through large cohort survival analysis and
further investigated its effects on cancer progression. METHODS: Large cohort
survival analysis of 7 cancer types, including colorectal cancer, breast cancer,
lung cancer, head and neck cancer, liver cancer, glioblastoma, and ovarian
cancer, was performed using public database at RNA level and was further
confirmed by IHC analysis at protein level. Phenotype parameters of DDX3
knockdown colon cancer cells and the mechanism of DDX3 regulated cancer
progression were investigated in vitro and in vivo. RESULTS: In large cohort
survival analysis, DDX3 had a significant prognostic predictive power in
colorectal cancer at both RNA and protein level. Patients with low DDX3
expression had poor prognosis and frequent distant metastasis. Knockdown of DDX3
enhanced the migration and invasion abilities of colon cancer cells and promoted
tumor metastasis in vivo. Snail upregulation with decreased membranous E-cadherin
expression and reduced cell aggregation were found after DDX3 downregulation.
CONCLUSIONS: Our study revealed the strong prognostic effect of DDX3 on
colorectal cancer among seven major cancer types through larger cohort survival
analysis at RNA and protein level. Low DDX3 expression promotes Snail/E-cadherin
pathway mediated cancer metastasis and poor clinical outcome in colorectal cancer
patients.