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Prediction of Tumor-Infiltrating CD20+ B-Cells in Patients with Pancreatic Ductal Adenocarcinoma Using a Multilayer Perceptron Network Classifier Based on Non-contrast MRI

Published:December 16, 2021DOI:https://doi.org/10.1016/j.acra.2021.11.013

      Rationale and Objectives

      Conventional chemotherapy has limited benefit in pancreatic ductal adenocarcinoma (PDAC), necessitating identification of novel therapeutic targets. Radiomics may enable non-invasive prediction of CD20 expression, a hypothesized therapeutic target in PDAC. To develop a machine learning classifier based on noncontrast magnetic resonance imaging for predicting CD20 expression in PDAC.

      Materials and Methods

      Retrospective study was conducted on preoperative noncontrast magnetic resonance imaging of 156 patients with pathologically confirmed PDAC from January 2017 to April 2018. For each patient, 1409 radiomics features were selected using minimum absolute contraction and selective operator logistic regression algorithms. CD20 expression was quantified using immunohistochemistry. A multilayer perceptron network classifier was developed using the training and validation set.

      Results

      A log-rank test showed that the CD20-high group (22.37 months, 95% CI: 19.10–25.65) had significantly longer survival than the CD20-low group (14.9 months, 95% CI: 10.96–18.84). The predictive model showed good differentiation in training (area under the curve [AUC], 0.79) and validation (AUC, 0.79) sets. Sensitivity, specificity, accuracy, positive predictive value, and negative predictive value were 73.21%, 75.47%, 0.74, 0.76, and 0.73, respectively, for the training set and 69.23%, 80.95%, 0.74, 0.82, and 0.68, respectively, for the validation set.

      Conclusion

      Multilayer perceptron classifier based on noncontrast magnetic resonance imaging scanning can predict the level of CD20 expression in PDAC patients.

      Key Words

      Abbreviation:

      PDAC (pancreatic ductal adenocarcinoma), TIL (tumor-infiltrating lymphocyte), OS (overall survival), US-FNA (ultrasound-guided fine-needle aspiration), CT (computed tomography), MRI (magnetic resonance imaging), TR (repetition time), TE (echo time), FOV (field of view), ROI (region of interest), ICC (intraclass correlation coefficient), MLP (multilayer perceptron), AUC (area under the curve), DCA (decision curve analysis), CI (confidence interval), T1WI (T1-weighted imaging), T2WI (T2-weighted imaging)
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