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2017 ; 8
(44
): 76290-76304
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gab.com Text
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Molecular signatures reflecting microenvironmental metabolism and
chemotherapy-induced immunogenic cell death in colorectal liver metastases
#MMPMID29100312
Østrup O
; Dagenborg VJ
; Rødland EA
; Skarpeteig V
; Silwal-Pandit L
; Grzyb K
; Berstad AE
; Fretland ÅA
; Mælandsmo GM
; Børresen-Dale AL
; Ree AH
; Edwin B
; Nygaard V
; Flatmark K
Oncotarget
2017[Sep]; 8
(44
): 76290-76304
PMID29100312
show ga
BACKGROUND: Metastatic colorectal cancer (CRC) is associated with highly variable
clinical outcome and response to therapy. The recently identified consensus
molecular subtypes (CMS1-4) have prognostic and therapeutic implications in
primary CRC, but whether these subtypes are valid for metastatic disease is
unclear. We performed multi-level analyses of resectable CRC liver metastases
(CLM) to identify molecular characteristics of metastatic disease and evaluate
the clinical relevance. METHODS: In this ancillary study to the Oslo-CoMet trial,
CLM and tumor-adjacent liver tissue from 46 patients were analyzed by profiling
mutations (targeted sequencing), genome-wide copy number alteration (CNAs), and
gene expression. RESULTS: Somatic mutations and CNAs detected in CLM were similar
to reported primary CRC profiles, while CNA profiles of eight metastatic pairs
suggested intra-patient divergence. A CMS classifier tool applied to gene
expression data, revealed the cohort to be highly enriched for CMS2. Hierarchical
clustering of genes with highly variable expression identified two subgroups
separated by high or low expression of 55 genes with immune-related and metabolic
functions. Importantly, induction of genes and pathways associated with
immunogenic cell death (ICD) was identified in metastases exposed to neoadjuvant
chemotherapy (NACT). CONCLUSIONS: The uniform classification of CLM by CMS
subtyping may indicate that novel class discovery approaches need to be explored
to uncover clinically useful stratification of CLM. Detected gene expression
signatures support the role of metabolism and chemotherapy in shaping the immune
microenvironment of CLM. Furthermore, the results point to rational exploration
of immune modulating strategies in CLM, particularly by exploiting NACT-induced
ICD.