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2016 ; 8
(ä): 25
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Different definitions of CpG island methylator phenotype and outcomes of
colorectal cancer: a systematic review
#MMPMID26941852
Jia M
; Gao X
; Zhang Y
; Hoffmeister M
; Brenner H
Clin Epigenetics
2016[]; 8
(ä): 25
PMID26941852
show ga
Contradictory results were reported for the prognostic role of CpG island
methylator phenotype (CIMP) among colorectal cancer (CRC) patients. Differences
in the definitions of CIMP were the most common explanation for these
discrepancies. The aim of this systematic review was to give an overview of the
published studies on CRC prognosis according to the different definitions of
CIMP. A systematic literature search was performed in MEDLINE and ISI Web of
Science for articles published until 3 April 2015. Data extraction included
information about the study population, the definition of CIMP, and investigated
outcomes. Thirty-six studies were included in this systematic review. Among them,
30 studies reported the association of CIMP and CRC prognosis and 11 studies
reported the association of CIMP with survival after CRC therapy. Overall, 16
different definitions of CIMP were identified. The majority of studies reported a
poorer prognosis for patients with CIMP-positive (CIMP+)/CIMP-high (CIMP-H) CRC
than with CIMP-negative (CIMP-)/CIMP-low (CIMP-L) CRC. Inconsistent results or
varying effect strengths could not be explained by different CIMP definitions
used. No consistent variation in response to specific therapies according to CIMP
status was found. Comparative analyses of different CIMP panels in the same large
study populations are needed to further clarify the role of CIMP definitions and
to find out how methylation information can best be used to predict CRC prognosis
and response to specific CRC therapies.