Multi-input deep learning architecture for predicting breast tumor response to chemotherapy using quantitative MR images

Abstract

Purpose

Neoadjuvant chemotherapy (NAC) aims to minimize the tumor size before surgery. Predicting response to NAC could reduce toxicity and delays to effective intervention. Computational analysis of dynamic contrast-enhanced magnetic resonance images (DCE-MRI) through deep convolution neural network (CNN) has shown a significant performance to distinguish responders and no responder’s patients. This study intends to present a new deep learning (DL) model predicting the breast cancer response to NAC based on multiple MRI inputs.

Methods

A cohort of 723 axial slices extracted from 42 breast cancer patients who underwent NAC therapy was used to train and validate the developed DL model. This dataset was provided by our collaborator institute of radiology in Brussels. Fourteen external cases were used to validate the best obtained model to predict pCR based on pre- and post-chemotherapy DCE-MRI. The model performance was assessed by area under the receiver operating characteristic curve (AUC), accuracy, sensitivity, specificity, and feature map visualization.

Results

The developed multi-inputs deep learning architecture was able to predict the pCR to NAC treatment in the validation dataset with an AUC of 0.91 using combined pre- and post-NAC images. The visual results showed that the most important extracted features from non-pCR tumors are in the peripheral region. The proposed method was more productive than the previous ones.

Conclusion

Even with a limited training dataset size, the proposed and developed CNN model using DCE-MR images acquired before and after the first chemotherapy was able to classify pCR and non-pCR patients with substantial accuracy. This model could be used hereafter in clinical analysis after its evaluation based on more extra data.

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Acknowledgements

We would like to address our sincere acknowledgments to Dr. Marc Lemort, the head of the Radiology Department at the Jules Bordet Institute—Brussels, for offering the dataset used to evaluate our implemented models.

Funding

This research was financially supported by the University of Mons in Belgium.

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Correspondence to Mohammed El Adoui.

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El Adoui, M., Drisis, S. & Benjelloun, M. Multi-input deep learning architecture for predicting breast tumor response to chemotherapy using quantitative MR images. Int J CARS (2020). https://doi.org/10.1007/s11548-020-02209-9

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Keywords

  • Deep learning
  • CNN
  • Multi-input network
  • Breast cancer
  • DCE-MRI
  • Features visualization