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DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer
Background: Biomarkers predicting response to bevacizumab in breast cancer are still missing. Since epigenetic modifications can contribute to an aberrant regulation of angiogenesis and treatment resistance, we investigated the influence of DNA methylation patterns on bevacizumab efficacy. Methods:...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Ivyspring International Publisher
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5928889/ https://www.ncbi.nlm.nih.gov/pubmed/29721079 http://dx.doi.org/10.7150/thno.23544 |
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author | Gampenrieder, Simon Peter Rinnerthaler, Gabriel Hackl, Hubert Pulverer, Walter Weinhaeusel, Andreas Ilic, Suzana Hufnagl, Clemens Hauser-Kronberger, Cornelia Egle, Alexander Risch, Angela Greil, Richard |
author_facet | Gampenrieder, Simon Peter Rinnerthaler, Gabriel Hackl, Hubert Pulverer, Walter Weinhaeusel, Andreas Ilic, Suzana Hufnagl, Clemens Hauser-Kronberger, Cornelia Egle, Alexander Risch, Angela Greil, Richard |
author_sort | Gampenrieder, Simon Peter |
collection | PubMed |
description | Background: Biomarkers predicting response to bevacizumab in breast cancer are still missing. Since epigenetic modifications can contribute to an aberrant regulation of angiogenesis and treatment resistance, we investigated the influence of DNA methylation patterns on bevacizumab efficacy. Methods: Genome-wide methylation profiling using the Illumina Infinium HumanMethylation450 BeadChip was performed in archival FFPE specimens of 36 patients with HER2-negative metastatic breast cancer treated with chemotherapy in combination with bevacizumab as first-line therapy (learning set). Based on objective response and progression-free survival (PFS) and considering ER expression, patients were divided in responders (R) and non-responders (NR). Significantly differentially methylated gene loci (CpGs) with a strong change in methylation levels (Δβ>0.15 or Δβ<-0.15) between R and NR were identified and further investigated in 80 bevacizumab-treated breast cancer patients (optimization set) and in 15 patients treated with chemotherapy alone (control set) using targeted deep amplicon bisulfite sequencing. Methylated gene loci were considered predictive if there was a significant association with outcome (PFS) in the optimization set but not in the control set using Spearman rank correlation, Cox regression, and logrank test. Results: Differentially methylated loci in 48 genes were identified, allowing a good separation between R and NR (odds ratio (OR) 101, p<0.0001). Methylation of at least one cytosine in 26 gene-regions was significantly associated with progression-free survival (PFS) in the optimization set, but not in the control set. Using information from the optimization set, the panel was reduced to a 9-gene signature, which could divide patients from the learning set into 2 clusters, thereby predicting response with an OR of 40 (p<0.001) and an AUC of 0.91 (LOOCV). A further restricted 3-gene methylation model showed a significant association of predicted responders with longer PFS in the learning and optimization set even in multivariate analysis with an excellent and good separation of R and NR with AUC=0.94 and AUC=0.86, respectively. Conclusion: Both a 9-gene and 3-gene methylation signature can discriminate between R and NR to a bevacizumab-based therapy in MBC and could help identify patients deriving greater benefit from bevacizumab. |
format | Online Article Text |
id | pubmed-5928889 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Ivyspring International Publisher |
record_format | MEDLINE/PubMed |
spelling | pubmed-59288892018-05-02 DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer Gampenrieder, Simon Peter Rinnerthaler, Gabriel Hackl, Hubert Pulverer, Walter Weinhaeusel, Andreas Ilic, Suzana Hufnagl, Clemens Hauser-Kronberger, Cornelia Egle, Alexander Risch, Angela Greil, Richard Theranostics Research Paper Background: Biomarkers predicting response to bevacizumab in breast cancer are still missing. Since epigenetic modifications can contribute to an aberrant regulation of angiogenesis and treatment resistance, we investigated the influence of DNA methylation patterns on bevacizumab efficacy. Methods: Genome-wide methylation profiling using the Illumina Infinium HumanMethylation450 BeadChip was performed in archival FFPE specimens of 36 patients with HER2-negative metastatic breast cancer treated with chemotherapy in combination with bevacizumab as first-line therapy (learning set). Based on objective response and progression-free survival (PFS) and considering ER expression, patients were divided in responders (R) and non-responders (NR). Significantly differentially methylated gene loci (CpGs) with a strong change in methylation levels (Δβ>0.15 or Δβ<-0.15) between R and NR were identified and further investigated in 80 bevacizumab-treated breast cancer patients (optimization set) and in 15 patients treated with chemotherapy alone (control set) using targeted deep amplicon bisulfite sequencing. Methylated gene loci were considered predictive if there was a significant association with outcome (PFS) in the optimization set but not in the control set using Spearman rank correlation, Cox regression, and logrank test. Results: Differentially methylated loci in 48 genes were identified, allowing a good separation between R and NR (odds ratio (OR) 101, p<0.0001). Methylation of at least one cytosine in 26 gene-regions was significantly associated with progression-free survival (PFS) in the optimization set, but not in the control set. Using information from the optimization set, the panel was reduced to a 9-gene signature, which could divide patients from the learning set into 2 clusters, thereby predicting response with an OR of 40 (p<0.001) and an AUC of 0.91 (LOOCV). A further restricted 3-gene methylation model showed a significant association of predicted responders with longer PFS in the learning and optimization set even in multivariate analysis with an excellent and good separation of R and NR with AUC=0.94 and AUC=0.86, respectively. Conclusion: Both a 9-gene and 3-gene methylation signature can discriminate between R and NR to a bevacizumab-based therapy in MBC and could help identify patients deriving greater benefit from bevacizumab. Ivyspring International Publisher 2018-03-11 /pmc/articles/PMC5928889/ /pubmed/29721079 http://dx.doi.org/10.7150/thno.23544 Text en © Ivyspring International Publisher This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions. |
spellingShingle | Research Paper Gampenrieder, Simon Peter Rinnerthaler, Gabriel Hackl, Hubert Pulverer, Walter Weinhaeusel, Andreas Ilic, Suzana Hufnagl, Clemens Hauser-Kronberger, Cornelia Egle, Alexander Risch, Angela Greil, Richard DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title | DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title_full | DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title_fullStr | DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title_full_unstemmed | DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title_short | DNA Methylation Signatures Predicting Bevacizumab Efficacy in Metastatic Breast Cancer |
title_sort | dna methylation signatures predicting bevacizumab efficacy in metastatic breast cancer |
topic | Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5928889/ https://www.ncbi.nlm.nih.gov/pubmed/29721079 http://dx.doi.org/10.7150/thno.23544 |
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