Metabolomics investigates biochemical processes directly, potentially complementing transcriptomics and proteomics in providing insight into treatment outcome.
This study aimed to use magnetic resonance (MR) spectroscopy on breast tumor tissue to explore the effect of neoadjuvant therapy on metabolic profiles, determine metabolic effects of the antiangiogenic drug bevacizumab, and investigate metabolic differences between responders and non-responders.
Breast tumors from 122 patients were profiled using high resolution magic angle spinning MR spectroscopy. All patients received neoadjuvant chemotherapy, and were randomized to receive bevacizumab or not. Tumors were biopsied prior, during, and after treatment.
Principal component analysis showed clear metabolic changes indicating a decline in glucose consumption and a transition to normal breast adipose tissue as an effect of chemotherapy. Partial least squares-discriminant analysis revealed metabolic differences between pathological minimal residual disease patients and pathological non-responders after treatment (accuracy of 77%, p < 0.001), but not before or during treatment. Lower glucose and higher lactate was observed in patients exhibiting a good response (≥90% tumor reduction) compared to those with no response (≤10% tumor reduction) before treatment, while the opposite was observed after treatment. Bevacizumab-receiving and chemotherapy-only patients could not be discriminated at any time point. Linear mixed-effects models revealed a significant interaction between time and bevacizumab for glutathione, indicating higher levels of this antioxidant in chemotherapy-only patients than in bevacizumab receivers after treatment.
MR spectroscopy showed potential in detecting metabolic response to treatment and complementing other molecular assays for the elucidation of underlying mechanisms affecting pathological response.
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False discovery rate
Human epidermal growth factor receptor 2
- HR MAS MRS:
High resolution magic angle spinning magnetic resonance spectroscopy
Linear mixed-effects model
Multiple imputation by chained equations
Magnetic resonance imaging
Orthogonal partial least squares
Prediction analysis of microarrays 50
Principal component analysis
Pathological complete response
Partial least squares-discriminant analysis
Pathological minimal residual disease
Probabilistic quotient normalization
Root mean square error
Reactive oxygen species
- R2 :
Coefficient of determination
Vascular endothelial growth factor
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The authors would like to thank Øyvind Salvesen for useful discussions regarding linear mixed-effects models and Santosh Lamichhane for technical support during HR MAS MRS acquisition. The HR MAS MRS analysis was performed at the MR Core Facility, Norwegian University of Science and Technology (NTNU), which is funded by the Faculty of Medicine and Health Sciences at NTNU and the Central Norway Regional Health Authority. The study was funded in part by generous grants from: (1) The Research Council of Norway, Imaging the breast cancer metabolome, Project no 221879, (2) The Pink Ribbon Movement and Norwegian Breast Cancer Society, (3) K. G. Jebsen Center for Breast Cancer Research, (4) Roche Norway, (5) Sanofi-Aventis Norway. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
The NeoAva study was co-sponsored by Roche Norway and Sanofi-Aventis Norway. Oslo University Hospital is the main sponsor for the NeoAva study.
LRE, THH, GFG, RV, JE, LSP, GP, LMCB, ALBD, OE, and TFB participated in the design of the study. ALBD, OE, and TFB conceived the study. LRE, THH, GFG, RV, JE, GP, LMCB, ALBD, OE, and TFB interpreted the data. LRE performed the HR MAS MRS acquisition, statistical analysis, and drafted the manuscript. LSP, SL, EB, OG, ALBD, OE, and TFB participated in acquisition of the data. All authors have read and helped to revise the manuscript. The final manuscript is approved by all the authors.
The study was approved for all centers involved by the Regional Ethics Committee (Approval number S-08354a) and the Norwegian Medical Agency.
Research involving human and animal rights
All procedures performed in studies involving human participants were in accordance with the Declaration of Helsinki, International Conference on Harmony/Good Clinical practice.
Informed written consent was obtained from all patients.
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Euceda, L.R., Haukaas, T.H., Giskeødegård, G.F. et al. Evaluation of metabolomic changes during neoadjuvant chemotherapy combined with bevacizumab in breast cancer using MR spectroscopy. Metabolomics 13, 37 (2017). https://doi.org/10.1007/s11306-017-1168-0
- Breast cancer
- HR MAS MRS