Abstract
Objectives
To assess early changes in synthetic relaxometry after neoadjuvant chemotherapy (NAC) for breast cancer and establish a model with contrast-free quantitative parameters for early prediction of pathological response.
Methods
From March 2019 to January 2021, breast MRI were performed for a primary cohort of women with breast cancer before (n = 102) and after the first (n = 93) and second (n = 90) cycle of NAC. Tumor size, synthetic relaxometry (T1/T2 relaxation time [T1/T2], proton density), and ADC were obtained, and the changes after treatment were calculated. Prediction models were established by multivariate logistic regression; evaluated with discrimination, calibration, and clinical application; and compared with Delong tests, net reclassification (NRI), and integrated discrimination index (IDI). External validation was performed from February to June 2021 with an independent cohort of 35 patients.
Results
In the primary cohort, all parameters changed after early treatment. Synthetic relaxometry decreased to a greater degree in major histologic responders (MHR, Miller–Payne G4-5) compared with non-MHR (Miller–Payne G1-3). A model combining ADC after treatment, changes in T1 and tumor size, and cancer subtype achieved the highest AUC after the first (primary/validation cohort, 0.83/0.82) and second cycles (primary/validation cohort, 0.85/0.84). No difference of AUC (p ≥ 0.27), NRI (p ≥ 0.31), and IDI (p ≥ 0.32) was found between models with different cycles and size-measured sequences. Model calibration and decision curves demonstrated a good fitness and clinical benefit, respectively.
Conclusions
Early reduction in synthetic relaxometry indicated pathological response to NAC. Contrast-free T1 and ADC combined with size and cancer subtype predicted effectively pathological response after one NAC cycle.
Key Points
• Synthetic MRI relaxometry changed after early neoadjuvant chemotherapy, which demonstrated pathological response for mass-like breast cancers.
• Contrast-free quantitative parameters including T1 relaxation time and apparent diffusion coefficient, combined with tumor size and cancer subtype, stratified major histologic responders.
• A contrast-free model predicted an early pathological response after the first treatment cycle of neoadjuvant chemotherapy.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AUC:
-
Area under the ROC curve
- DCE:
-
Dynamic contrast enhanced
- DWI:
-
Diffusion-weighted imaging
- MHR:
-
Major histologic responders
- NAC:
-
Neoadjuvant chemotherapy
- PD:
-
Proton density
- ROC:
-
Receiver operating characteristic
- T1:
-
T1 relaxation time
- T2:
-
T2 relaxation time
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Acknowledgements
The authors thank Fei Bie and Yan Guo from GE Healthcare for the technical support, and AiMi Academic Services (www.aimieditor.com) for the English language editing and review services.
Funding
This study has received funding from the National Financial Appropriation Research Project [grant number 2017YFC1309100], National Scientific Foundation of China [grant number 81971695], and the "Set Sail” Project of the First Affiliated Hospital of China Medical University [grant number 36028].
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Institutional Review Board approval was obtained from the Ethics Committee of Medical Science Research in the First Affiliated Hospital of China Medical University (No. 2019-33-2).
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Written informed consent was obtained from all subjects (patients) in this study.
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The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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The scientific guarantor of this publication is Lina Zhang.
Statistics and Biometry
One of the authors (Hongbo Liu) has significant statistical expertise.
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Du, S., Gao, S., Zhao, R. et al. Contrast-free MRI quantitative parameters for early prediction of pathological response to neoadjuvant chemotherapy in breast cancer. Eur Radiol 32, 5759–5772 (2022). https://doi.org/10.1007/s00330-022-08667-w
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DOI: https://doi.org/10.1007/s00330-022-08667-w