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Cancer Cell International
Published in: Cancer Cell International 1/2015

Open Access 01-12-2015 | Primary research

Treatment with the PARP inhibitor, niraparib, sensitizes colorectal cancer cell lines to irinotecan regardless of MSI/MSS status

Authors: Sybil M Genther Williams, Apryle M Kuznicki, Paula Andrade, Brian M Dolinski, Cem Elbi, Ronan C O’Hagan, Carlo Toniatti

Published in: Cancer Cell International | Issue 1/2015

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Abstract

Background

Cells with homologous recombination (HR) deficiency, most notably caused by mutations in the BRCA1 or BRCA2 genes, are sensitive to PARP inhibition. Microsatellite instability (MSI) accounts for 10-15% of colorectal cancer (CRC) and is hypothesized to lead to HR defects due to altered expression of Mre11, a protein required for double strand break (DSB) repair. Indeed, others have reported that PARP inhibition is efficacious in MSI CRC.

Methods

Here we examine the response to niraparib, a potent PARP-1/PARP-2 inhibitor currently under clinical evaluation, in MSI versus microsatellite stable (MSS) CRC cell lines in vitro and in vivo. We compiled a large panel of MSI and MSS CRC cell lines and evaluated the anti-proliferative activity of niraparib. In addition to testing single agent cytotoxic activity of niraparib, we also tested irinotecan (or SN-38, the active metabolite of irinotecan) activity alone and in combination with niraparib in vitro and in vivo.

Results

In contrast to earlier reports, MSI CRC cell lines were not more sensitive to niraparib than MSS CRC cell lines¸ suggesting that the MSI phenotype does not sensitize CRC cell lines to PARP inhibition. Moreover, even the most sensitive MSI cell lines had niraparib EC50s greater than 10 fold higher than BRCA-deficient cell lines. However, MSI lines were more sensitive to SN-38 than MSS lines, consistent with previous findings. We have also demonstrated that combination of niraparib and irinotecan was more efficacious than either agent alone in both MSI and MSS cell lines both in vitro and in vivo, and that niraparib potentiates the effect of irinotecan regardless of MSI status.

Conclusions

Our results support the clinical evaluation of this combination in all CRC patients, regardless of MSI status.
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Metadata
Title
Treatment with the PARP inhibitor, niraparib, sensitizes colorectal cancer cell lines to irinotecan regardless of MSI/MSS status
Authors
Sybil M Genther Williams
Apryle M Kuznicki
Paula Andrade
Brian M Dolinski
Cem Elbi
Ronan C O’Hagan
Carlo Toniatti
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2015
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/s12935-015-0162-8

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