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Preoperative prediction of postsurgical outcomes in mass-forming intrahepatic cholangiocarcinoma based on clinical, radiologic, and radiomics features

  • Hepatobiliary-Pancreas
  • Published:
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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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Correspondence to Mi-Suk Park or Seung Soo Lee.

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The scientific guarantor of this publication is S.S.L. and M.S.P.

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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.

Statistics and biometry

One of the authors (S.Y.P.) has significant statistical expertise.

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Written informed consent was waived by the Institutional Review Board.

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Institutional Review Board approval was obtained.

Methodology

• 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

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