Abstract
Purpose
To investigate the utility of histogram analysis of zoomed EPI diffusion-weighted imaging (DWI) for predicting the perineural invasion (PNI) status of rectal cancer (RC).
Methods
This prospective study evaluated 94 patients diagnosed with histopathologically confirmed RC between July 2020 and July 2021. Patients underwent preoperative rectal magnetic resonance imaging (MRI) examinations, including the zoomed EPI DWI sequence. Ten whole-tumor histogram parameters of each patient were derived from zoomed EPI DWI. Reproducibility was evaluated according to the intra-class correlation coefficient (ICC). The association of the clinico-radiological and histogram features with PNI status was assessed using univariable analysis for trend and multivariable logistic regression analysis with β value calculation. Receiver operating characteristic (ROC) curve analysis was conducted to assess the diagnostic performance.
Results
Forty-two patients exhibited positive PNI. The inter- and intraobserver agreements were excellent for the histogram parameters (all ICCs > 0.80). The maximum (p = 0.001), energy (p = 0.021), entropy (p = 0.021), kurtosis (p < 0.001), and skewness (p < 0.001) were significantly higher in the positive PNI group than in the negative PNI group. Multivariable analysis showed that higher MRI T stage [β = 2.154, 95% confidence interval (CI) 0.932–3.688; p = 0.002] and skewness (β = 0.779, 95% CI 0.255–1.382; p = 0.006) were associated with positive PNI. The model combining skewness and MRI T stage had an area under the ROC curve of 0.811 (95% CI 0.724–0.899) for predicting PNI status.
Conclusion
Histogram parameters in zoomed EPI DWI can help predict the PNI status in RC.
Graphical abstract
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Abbreviations
- AUC:
-
Area under the ROC curve
- CI:
-
Confidence interval
- DTA:
-
Distance from the inferior edge of the tumor to the anal verge
- DWI:
-
Diffusion-weighted imaging
- EMVI:
-
Extramural venous invasion
- EPI:
-
Echo-planar imaging
- ICC:
-
Intraclass correlation coefficient
- MRF:
-
Mesorectal fascia
- MRI:
-
Magnetic resonance imaging
- MTL:
-
Maximum tumor length
- MTT:
-
Maximum tumor thickness
- PNI:
-
Perineural invasion
- RC:
-
Rectal cancer
- ROC:
-
Receiver operating characteristic
- ROI:
-
Regions of interest
- SD:
-
Short-axis diameter
- ss-EPI:
-
Single-shot echo-planar imaging
- T2WI:
-
T2-weighted image
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Funding
This research is supported by the National Natural Science Foundation of China (Grant Number 81971589); CAMS Innovation Fund for Medical Sciences (CIFMS, Grant Number 2021-I2M-C&T-A-017); 2020 SKY Imaging Research Fund (Grant Number Z-2014-07-2003-01); and Youth Research Fund of Peking Union Medical College, the Fundamental Research Funds for the Central Universities (Grant Number 3332021098).
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Study concepts/study design, data acquisition, or data analysis/interpretation, all authors; quality control of date and algorithms, FY, XMZ, and HMZ; statistical analysis, LJW and HMZ; drafting the article or revising it critically for important intellectual content, all authors; final approval of the version to be submitted, all authors.
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All authors (Lijuan Wan, Wenjing Peng, Shuangmei Zou, Qinglei Shi, Peihua Wu, Qing Zhao, Feng Ye, Xinming Zhao, Hongmei Zhang) have no conflicts of interest to be disclosed related to this article.
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Wan, L., Peng, W., Zou, S. et al. Predicting perineural invasion using histogram analysis of zoomed EPI diffusion-weighted imaging in rectal cancer. Abdom Radiol 47, 3353–3363 (2022). https://doi.org/10.1007/s00261-022-03579-1
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DOI: https://doi.org/10.1007/s00261-022-03579-1