Loss of KCNQ1 expression in stage II and stage III colon cancer is a strong prognostic factor for disease recurrence.

Abstract:

BACKGROUND:Colorectal cancer (CRC) is the third most common cancer worldwide. Accurately identifying stage II CRC patients at risk for recurrence is an unmet clinical need. KCNQ1 was previously identified as a tumour suppressor gene and loss of expression was associated with poor survival in patients with CRC liver metastases. In this study the prognostic value of KCNQ1 in stage II and stage III colon cancer patients was examined. METHODS:KCNQ1 mRNA expression was assessed in 90 stage II colon cancer patients (AMC-AJCCII-90) using microarray gene expression data. Subsequently, KCNQ1 protein expression was evaluated in an independent cohort of 386 stage II and stage III colon cancer patients by immunohistochemistry of tissue microarrays. RESULTS:Low KCNQ1 mRNA expression in stage II microsatellite stable (MSS) colon cancers was associated with poor disease-free survival (DFS) (P=0.025). Loss of KCNQ1 protein expression from epithelial cells was strongly associated with poor DFS in stage II MSS (P<0.0001), stage III MSS (P=0.0001) and stage III microsatellite instable colon cancers (P=0.041). KCNQ1 seemed an independent prognostic value in addition to other high-risk parameters like angio-invasion, nodal stage and microsatellite instability-status. CONCLUSIONS:We conclude that KCNQ1 is a promising biomarker for prediction of disease recurrence and may aid stratification of patients with stage II MSS colon cancer for adjuvant chemotherapy.

journal_name

Br J Cancer

authors

den Uil SH,Coupé VM,Linnekamp JF,van den Broek E,Goos JA,Delis-van Diemen PM,Belt EJ,van Grieken NC,Scott PM,Vermeulen L,Medema JP,Bril H,Stockmann HB,Cormier RT,Meijer GA,Fijneman RJ

doi

10.1038/bjc.2016.376

subject

Has Abstract

pub_date

2016-12-06 00:00:00

pages

1565-1574

issue

12

eissn

0007-0920

issn

1532-1827

pii

bjc2016376

journal_volume

115

pub_type

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