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Published in: Annals of Surgical Oncology 4/2024

Open Access 27-12-2023 | Computed Tomography | Pancreatic Tumors

Delta Radiomic Features Predict Resection Margin Status and Overall Survival in Neoadjuvant-Treated Pancreatic Cancer Patients

Authors: Kai Wang, PhD, John D. Karalis, MD, Ahmed Elamir, MD, Alessandro Bifolco, MD, Megan Wachsmann, MD, Giovanni Capretti, MD, Paola Spaggiari, MD, Sebastian Enrico, BSA, Kishore Balasubramanian, MS, Nafeesah Fatimah, MD, Giada Pontecorvi, PhD, Martina Nebbia, MD, Adam Yopp, MD, Ravi Kaza, MD, Ivan Pedrosa, MD, PhD, Herbert Zeh III, MD, Patricio Polanco, MD, Alessandro Zerbi, MD, Jing Wang, PhD, Todd Aguilera, MD, PhD, Matteo Ligorio, MD, PhD

Published in: Annals of Surgical Oncology | Issue 4/2024

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Abstract

Background

Neoadjuvant therapy (NAT) emerged as the standard of care for patients with pancreatic ductal adenocarcinoma (PDAC) who undergo surgery; however, surgery is morbid, and tools to predict resection margin status (RMS) and prognosis in the preoperative setting are needed. Radiomic models, specifically delta radiomic features (DRFs), may provide insight into treatment dynamics to improve preoperative predictions.

Methods

We retrospectively collected clinical, pathological, and surgical data (patients with resectable, borderline, locally advanced, and metastatic disease), and pre/post-NAT contrast-enhanced computed tomography (CT) scans from PDAC patients at the University of Texas Southwestern Medical Center (UTSW; discovery) and Humanitas Hospital (validation cohort). Gross tumor volume was contoured from CT scans, and 257 radiomics features were extracted. DRFs were calculated by direct subtraction of pre/post-NAT radiomic features. Cox proportional models and binary prediction models, including/excluding clinical variables, were constructed to predict overall survival (OS), disease-free survival (DFS), and RMS.

Results

The discovery and validation cohorts comprised 58 and 31 patients, respectively. Both cohorts had similar clinical characteristics, apart from differences in NAT (FOLFIRINOX vs. gemcitabine/nab-paclitaxel; p < 0.05) and type of surgery resections (pancreatoduodenectomy, distal or total pancreatectomy; p < 0.05). The model that combined clinical variables (pre-NAT carbohydrate antigen (CA) 19-9, the change in CA19-9 after NAT (∆CA19-9), and resectability status) and DRFs outperformed the clinical feature-based models and other radiomics feature-based models in predicting OS (UTSW: 0.73; Humanitas: 0.66), DFS (UTSW: 0.75; Humanitas: 0.64), and RMS (UTSW 0.73; Humanitas: 0.69).

Conclusions

Our externally validated, predictive/prognostic delta-radiomics models, which incorporate clinical variables, show promise in predicting the risk of predicting RMS in NAT-treated PDAC patients and their OS or DFS.
Appendix
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Metadata
Title
Delta Radiomic Features Predict Resection Margin Status and Overall Survival in Neoadjuvant-Treated Pancreatic Cancer Patients
Authors
Kai Wang, PhD
John D. Karalis, MD
Ahmed Elamir, MD
Alessandro Bifolco, MD
Megan Wachsmann, MD
Giovanni Capretti, MD
Paola Spaggiari, MD
Sebastian Enrico, BSA
Kishore Balasubramanian, MS
Nafeesah Fatimah, MD
Giada Pontecorvi, PhD
Martina Nebbia, MD
Adam Yopp, MD
Ravi Kaza, MD
Ivan Pedrosa, MD, PhD
Herbert Zeh III, MD
Patricio Polanco, MD
Alessandro Zerbi, MD
Jing Wang, PhD
Todd Aguilera, MD, PhD
Matteo Ligorio, MD, PhD
Publication date
27-12-2023
Publisher
Springer International Publishing
Published in
Annals of Surgical Oncology / Issue 4/2024
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-023-14805-5

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