Abstract
Purpose
The aim of this single-center retrospective study is to assess whether contrast-enhanced computed tomography (CECT) radiomics analysis is predictive of gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs) grade based on the 2019 World Health Organization (WHO) classification and to establish a tumor grade (G) prediction model.
Material and methods
Preoperative CECT images of 78 patients with GEP-NENs were retrospectively reviewed and divided in two groups (G1–G2 in class 0, G3-NEC in class 1). A total of 107 radiomics features were extracted from each neoplasm ROI in CT arterial and venous phases acquisitions with 3DSlicer. Mann–Whitney test and LASSO regression method were performed in R for feature selection and feature reduction, in order to build the radiomic-based predictive model. The model was developed for a training cohort (75% of the total) and validated on the independent validation cohort (25%). ROC curves and AUC values were generated on training and validation cohorts.
Results
40 and 24 features, for arterial phase and venous phase, respectively, were found to be significant in class distinction. From the LASSO regression 3 and 2 features, for arterial phase and venous phase, respectively, were identified as suitable for groups classification and used to build the tumor grade radiomic-based prediction model. The prediction of the arterial model resulted in AUC values of 0.84 (95% CI 0.72–0.97) and 0.82 (95% CI 0.62–1) for the training cohort and validation cohort, respectively, while the prediction of the venous model yielded AUC values of 0.7877 (95% CI 0.6416–0.9338) and 0.6813 (95% CI 0.3933–0.9693) for the training cohort and validation cohort, respectively.
Conclusions
CT-radiomics analysis may aid in differentiating the histological grade for GEP-NENs.
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IARC Publications Website—WHO Classification of Tumours of the Digestive System [Internet]
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Conceptualization was performed by GG and BM. Formal analysis was performed by GC, FF, PT and SB. Investigation was performed by GC and FF. Resources were collected by SB. Data curation was performed by GC, FF, EP and LM. GC, FF and GG were involved in writing—original draft preparation. GG was involved in writing—review and editing and project administration. Visualization was performed by GC, PT and SB. BM, VG, SP, DM and VM performed supervision. All authors have read and agreed to the published version of the manuscript.
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Institutional Review Board Statement number 13261_oss date of approval February 02, 2021. The study was conducted according to the guidelines of the Declaration of Helsinki.
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Informed consent was obtained from all subjects involved in the study. All patients gave their informed consent for the CT examination with intravenous administration. Patients’ records were anonymized and de-identified prior to analysis.
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Chiti, G., Grazzini, G., Flammia, F. et al. Gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs): a radiomic model to predict tumor grade. Radiol med 127, 928–938 (2022). https://doi.org/10.1007/s11547-022-01529-x
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DOI: https://doi.org/10.1007/s11547-022-01529-x