Abstract
Objectives
Current prognostic systems for intrahepatic cholangiocarcinoma (IHCC) rely on surgical pathology data and are not applicable to a preoperative setting. We aimed to develop and validate preoperative models to predict postsurgical outcomes in mass-forming IHCC patients based on clinical, radiologic, and radiomics features.
Methods
This multicenter retrospective cohort study included patients who underwent curative-intent resection for mass-forming IHCC. In the development cohort (single institution data), three preoperative multivariable Cox models for predicting recurrence-free survival (RFS) were constructed, including the clinical-radiologic, radiomics, and clinical-radiologic-radiomics (CRR) models based on clinical and CT findings, CT-radiomics features, and a combination of both, respectively. Model performance was evaluated in the test cohort (data from five institutions) using Harrell’s C-index and compared with postoperative prognostic systems.
Results
A total of 345 patients (233, development cohort; 112, test cohort) were evaluated. The clinical-radiologic model included five independent CT predictors (infiltrative contour, multiplicity, periductal infiltration, extrahepatic organ invasion, and suspicious metastatic lymph node) and showed similar performance in predicting RFS to the radiomics model (C-index, 0.65 vs. 0.68; p = 0.43 in the test cohort). The CRR model showed significantly improved performance (C-index, 0.71; p = 0.01) than the clinical-radiologic model and demonstrated similar performance to the postoperative prognostic systems in predicting RFS (C-index, 0.71–0.73 vs. 0.70–0.73; p ≥ 0.40) and overall survival (C-index, 0.68–0.71 vs. 0.64–0.74; p ≥ 0.27) in the test cohort.
Conclusions
A model integrating clinical, CT, and radiomics information may be useful for the preoperative assessment of postsurgical outcomes in patients with mass-forming IHCC.
Key Points
• The radiomics analysis had incremental value in predicting recurrence-free survival of patients with intrahepatic mass-forming cholangiocarcinoma.
• The clinical-radiologic-radiomics model demonstrated similar performance to the postoperatively available prognostic systems (including 8th AJCC system) in predicting recurrence-free survival and overall survival.
• The clinical-radiologic-radiomics model may be useful for the preoperative assessment of postsurgical outcomes in patients with mass-forming intrahepatic cholangiocarcinoma.
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Abbreviations
- AJCC:
-
American Joint Committee on Cancer
- AP:
-
Arterial phase
- CA19-9:
-
Carbohydrate antigen 19-9
- CEA:
-
Carcinoembryonic antigen
- CI:
-
Confidence interval
- CR:
-
Clinical-radiologic
- CRR:
-
Clinical-radiologic-radiomics
- HR:
-
Hazard ratio
- ICC:
-
Intraclass correlation coefficient
- IDI:
-
Integrated discrimination improvement
- IHCC:
-
Intrahepatic cholangiocarcinoma
- LASSO:
-
Least absolute shrinkage and selection operator
- NRI:
-
Net reclassification improvement
- OS:
-
Overall survival
- PVP:
-
Portal venous phase
- RFS:
-
Recurrence-free survival
- VOI:
-
Volume of interest
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Funding
This study has received funding by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Grant No. 2020R1F1A1048826).
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The scientific guarantor of this publication is S.S.L. and M.S.P.
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One of the authors (S.Y.P.) has significant statistical expertise.
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• retrospective
• diagnostic or prognostic study
• multicenter study
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Park, H.J., Park, B., Park, S.Y. et al. Preoperative prediction of postsurgical outcomes in mass-forming intrahepatic cholangiocarcinoma based on clinical, radiologic, and radiomics features. Eur Radiol 31, 8638–8648 (2021). https://doi.org/10.1007/s00330-021-07926-6
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DOI: https://doi.org/10.1007/s00330-021-07926-6