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2016 ; 4
(5
): 733-739
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An 80-gene set to predict response to preoperative chemoradiotherapy for rectal
cancer by principle component analysis
#MMPMID27123272
Empuku S
; Nakajima K
; Akagi T
; Kaneko K
; Hijiya N
; Etoh T
; Shiraishi N
; Moriyama M
; Inomata M
Mol Clin Oncol
2016[May]; 4
(5
): 733-739
PMID27123272
show ga
Preoperative chemoradiotherapy (CRT) for locally advanced rectal cancer not only
improves the postoperative local control rate, but also induces downstaging.
However, it has not been established how to individually select patients who
receive effective preoperative CRT. The aim of this study was to identify a
predictor of response to preoperative CRT for locally advanced rectal cancer.
This study is additional to our multicenter phase II study evaluating the safety
and efficacy of preoperative CRT using oral fluorouracil (UMIN ID: 03396). From
April, 2009 to August, 2011, 26 biopsy specimens obtained prior to CRT were
analyzed by cyclopedic microarray analysis. Response to CRT was evaluated
according to a histological grading system using surgically resected specimens.
To decide on the number of genes for dividing into responder and non-responder
groups, we statistically analyzed the data using a dimension reduction method, a
principle component analysis. Of the 26 cases, 11 were responders and 15
non-responders. No significant difference was found in clinical background data
between the two groups. We determined that the optimal number of genes for the
prediction of response was 80 of 40,000 and the functions of these genes were
analyzed. When comparing non-responders with responders, genes expressed at a
high level functioned in alternative splicing, whereas those expressed at a low
level functioned in the septin complex. Thus, an 80-gene expression set that
predicts response to preoperative CRT for locally advanced rectal cancer was
identified using a novel statistical method.