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Copy number load predicts outcome of metastatic colorectal cancer patients receiving bevacizumab combination therapy.


ABSTRACT: Increased copy number alterations (CNAs) indicative of chromosomal instability (CIN) have been associated with poor cancer outcome. Here, we study CNAs as potential biomarkers of bevacizumab (BVZ) response in metastatic colorectal cancer (mCRC). We cluster 409 mCRCs in three subclusters characterized by different degrees of CIN. Tumors belonging to intermediate-to-high instability clusters have improved outcome following chemotherapy plus BVZ versus chemotherapy alone. In contrast, low instability tumors, which amongst others consist of POLE-mutated and microsatellite-instable tumors, derive no further benefit from BVZ. This is confirmed in 81 mCRC tumors from the phase 2 MoMa study involving BVZ. CNA clusters overlap with CRC consensus molecular subtypes (CMS); CMS2/4 xenografts correspond to intermediate-to-high instability clusters and respond to FOLFOX chemotherapy plus mouse avastin (B20), while CMS1/3 xenografts match with low instability clusters and fail to respond. Overall, we identify copy number load as a novel potential predictive biomarker of BVZ combination therapy.

SUBMITTER: Smeets D 

PROVIDER: S-EPMC6173768 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Copy number load predicts outcome of metastatic colorectal cancer patients receiving bevacizumab combination therapy.

Smeets Dominiek D   Miller Ian S IS   O'Connor Darran P DP   Das Sudipto S   Moran Bruce B   Boeckx Bram B   Gaiser Timo T   Betge Johannes J   Barat Ana A   Klinger Rut R   van Grieken Nicole C T NCT   Cremolini Chiara C   Prenen Hans H   Mazzone Massimiliano M   Depreeuw Jeroen J   Bacon Orna O   Fender Bozena B   Brady Joseph J   Hennessy Bryan T BT   McNamara Deborah A DA   Kay Elaine E   Verheul Henk M HM   Maarten Neerincx N   Gallagher William M WM   Murphy Verena V   Prehn Jochen H M JHM   Koopman Miriam M   Punt Cornelis J A CJA   Loupakis Fotios F   Ebert Matthias P A MPA   Ylstra Bauke B   Lambrechts Diether D   Byrne Annette T AT  

Nature communications 20181005 1


Increased copy number alterations (CNAs) indicative of chromosomal instability (CIN) have been associated with poor cancer outcome. Here, we study CNAs as potential biomarkers of bevacizumab (BVZ) response in metastatic colorectal cancer (mCRC). We cluster 409 mCRCs in three subclusters characterized by different degrees of CIN. Tumors belonging to intermediate-to-high instability clusters have improved outcome following chemotherapy plus BVZ versus chemotherapy alone. In contrast, low instabili  ...[more]

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