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MRI radiomics analysis for predicting preoperative synchronous distant metastasis in patients with rectal cancer

  • Gastrointestinal
  • Published:
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Abstract

Objectives

To investigate the value of MRI radiomics based on T2-weighted (T2W) images in predicting preoperative synchronous distant metastasis (SDM) in patients with rectal cancer.

Methods

This retrospective study enrolled 177 patients with histopathology-confirmed rectal adenocarcinoma (123 patients in the training cohort and 54 in the validation cohort). A total of 385 radiomics features were extracted from pretreatment T2W images. Five steps, including univariate statistical tests and a random forest algorithm, were performed to select the best preforming features for predicting SDM. Multivariate logistic regression analysis was conducted to build the clinical and clinical-radiomics combined models in the training cohort. The predictive performance was validated by receiver operating characteristics curve (ROC) analysis and clinical utility implementing a nomogram and decision curve analysis.

Results

Fifty-nine patients (33.3%) were confirmed to have SDM. Six radiomics features and four clinical characteristics were selected for predicting SDM. The clinical-radiomics combined model performed better than the clinical model in both the training and validation datasets. A threshold of 0.44 yielded an area under the ROC (AUC) value of 0.827 (95% confidence interval (CI), 0.6963–0.9580), a sensitivity of 72.2%, a specificity of 94.4%, and an accuracy of 87.0% in the validation cohort for the combined model. A clinical-radiomics nomogram and decision curve analysis confirmed the clinical utility of the combined model.

Conclusions

Our proposed clinical-radiomics combined model could be utilized as a noninvasive biomarker for identifying patients at high risk of SDM, which could aid in tailoring treatment strategies.

Key Points

• T2WI-based radiomics analysis helps predict synchronous distant metastasis (SDM) of rectal cancer.

• The clinical-radiomics combined model could be utilized as a noninvasive biomarker for predicting SDM.

• Personalized treatment can be carried out with greater confidence based on the risk stratification for SDM in rectal cancer.

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Abbreviations

AUC:

Area under the curve

CA199:

Carbohydrate antigen 199

CEA:

Carcinoembryonic antigen

DKI:

Diffusion kurtosis imaging

DWI:

Diffusion-weighted imaging

GLCM:

Gray-level co-occurrence matrix

GLRLM:

Gray-level run-length matrix

ICC:

Intraclass correlation coefficient

LN:

Lymph node

NPV:

Negative predictive value

PPV:

Positive predictive value

ROC:

Receiver operating characteristic curve

SDM:

Synchronous distant metastasis

VOI:

Volume of interest

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Funding

This study has received funding from the National Key Research and Development Program of China (No. 2017YFC0109003) and Special Research Program of Shanghai Municipal Commission of Heath and Family Planning on medical intelligence (No. 2018ZHYL0108).

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Dengbin Wang.

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Guarantor

The scientific guarantor of this publication is Dengbin Wang, MD, PhD, the chief of department of radiology, Xinhua hospital affiliated to Shanghai Jiao Tong University School of Medicine.

Conflict of interest

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.

Statistics and biometry

Shaofeng Duan kindly provided statistical advice for the manuscript.

Informed consent

Written informed consent was waived by the Institutional Review Board.

Ethical approval

Institutional Review Board approval was obtained.

Methodology

• retrospective

• diagnostic or prognostic study

• performed at one institution

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Liu, H., Zhang, C., Wang, L. et al. MRI radiomics analysis for predicting preoperative synchronous distant metastasis in patients with rectal cancer. Eur Radiol 29, 4418–4426 (2019). https://doi.org/10.1007/s00330-018-5802-7

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  • DOI: https://doi.org/10.1007/s00330-018-5802-7

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