Abstract
Objective
To explore the value of intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) for the prediction of pathologic response to neoadjuvant chemotherapy (NAC) in locally advanced esophageal squamous cell carcinoma (ESCC).
Material and methods
Forty patients with locally advanced ESCC who were treated with NAC followed by radical resection were prospectively enrolled from September 2015 to May 2018. MRI and IVIM were performed within 1 week before and 2–3 weeks after NAC, prior to surgery. Parameters including apparent diffusion coefficient (ADC), true diffusion coefficient (D), pseudodiffusion coefficient (D*), and pseudodiffusion fraction (f) before and after NAC were measured. Pathologic response was evaluated according to the AJCC tumor regression grade (TRG) system. The changes in IVIM values before and after therapy in different TRG groups were assessed. Receiver operating characteristic (ROC) curves analysis was used to determine the best cutoff value for predicting the pathologic response to NAC.
Results
Twenty-two patients were identified as TRG 2 (responders), and eighteen as TRG 3 (non-responders) in pathologic evaluation. The ADC, D, and f values increased significantly after NAC. The post-NAC D and ΔD values of responders were significantly higher than those of non-responders. The area under the curve (AUC) was 0.722 for post-NAC D and 0.859 for ΔD in predicting pathologic response. The cutoff values of post-NAC D and ΔD were 1.685 × 10−3 mm2/s and 0.350 × 10−3 mm2/s, respectively.
Conclusion
IVIM-DWI may be used as an effective functional imaging technique to predict pathologic response to NAC in locally advanced ESCC.
Key Points
• The optimal cutoff values of post-NAC D and ΔD for predicting pathologic response to NAC in locally advanced ESCC were 1.685 × 10−3 mm2/s and 0.350 × 10−3 mm2/s, respectively.
• Pathologic response to NAC in locally advanced ESCC was favorable in patients with post-NAC D and ΔD values that were higher than the optimal cutoff values.
• IVIM-DWI can potentially be used to preoperatively predict pathologic response to NAC in esophageal carcinoma. Accurate quantification of the D value derived from IVIM-DWI may eventually translate into an effective and non-invasive marker to predict therapeutic efficacy.
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Abbreviations
- 18F-FDG PET/CT:
-
Fluorine-18 fluorodeoxyglucose positron emission tomography-computed tomography
- ADC:
-
Apparent diffusion coefficient
- CI:
-
Confidence intervals
- CT:
-
Computed tomography
- D :
-
True diffusion coefficient
- D * :
-
Pseudodiffusion coefficient
- DCE-MRI:
-
Dynamic contrast-enhanced magnetic resonance images
- DWI:
-
Diffusion-weighted imaging
- ESCC:
-
Esophageal squamous cell carcinoma
- EUS:
-
Endoscopic ultrasonography
- f :
-
Pseudodiffusion fraction
- ICC:
-
Intraclass correlation coefficient
- iShim:
-
Integrated specific slice dynamic shim
- IVIM:
-
Intravoxel incoherent motion
- IVIM-DWI:
-
Intravoxel incoherent motion diffusion-weighted imaging
- MRI:
-
Magnetic resonance imaging
- NAC:
-
Neoadjuvant chemotherapy
- NT:
-
Neoadjuvant therapy
- RECIST:
-
Response evaluation criteria in solid tumors
- ROC:
-
Receiver operating characteristic
- ROI:
-
Region of interest
- SD:
-
Standard deviation
- SNR:
-
Signal-to-noise ratio
- TRG:
-
Tumor regression grade
- VIBE:
-
Volumetric interpolated breath hold examination
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Acknowledgments
We thank Prof. Ihab R. Kamel for valuable advices on revised manuscript and language editing.
Funding
This study has received funding by the National Natural Science Foundation of China (81972802) and National nature science foundation of Henan Province (182300410355).
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The scientific guarantor of this publication is Jinrong QU, MD, PHD.
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Two of the authors of this manuscript (Shaoyu Wang and Xu Yan) are employees of Siemens. The remaining authors declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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Yan Zhao, one of the authors has significant statistical expertise.
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Written informed consent was obtained from all subjects (patients) in this study.
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Song, T., Yao, Q., Qu, J. et al. The value of intravoxel incoherent motion diffusion-weighted imaging in predicting the pathologic response to neoadjuvant chemotherapy in locally advanced esophageal squamous cell carcinoma. Eur Radiol 31, 1391–1400 (2021). https://doi.org/10.1007/s00330-020-07248-z
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DOI: https://doi.org/10.1007/s00330-020-07248-z