Radiomics under 2D regions, 3D regions, and peritumoral regions reveal tumor heterogeneity in non-small cell lung cancer: a multicenter study

Xingping Zhang1,2,3, Guijuan Zhang4, Xingting Qiu5, Jiao Yin3, Wenjun Tan6, Xiaoxia Yin2, Hong Yang2, Liefa Liao7, Hua Wang3, Yanchun Zhang1,2,3
1Department of New Networks, Peng Cheng Laboratory, Shenzhen, China
2Cyberspace Institute of Advanced Technology, Guangzhou University, Guangzhou, China
3Institute for Sustainable Industries and Liveable Cities, Victoria University, Melbourne, Australia
4Department of Respiratory and Critical Care, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
5Department of Radiology, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
6Key Laboratory of Intelligent Computing in Medical Image, Ministry of Education, Northeastern University, Shenyang, China
7School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou, China

Tóm tắt

Lung cancer has significant genetic and phenotypic heterogeneity, leading to poor prognosis. Radiomic features have emerged as promising predictors of the tumor phenotype. However, the role of underlying information surrounding the cancer remains unclear. We conducted a retrospective study of 508 patients with NSCLC from three institutions. Radiomics models were built using features from six tumor regions and seven classifiers to predict three prognostically significant tumor phenotypes. The models were evaluated and interpreted by the mean area under the receiver operating characteristic curve (AUC) under nested cross-validation and Shapley values. The best-performing predictive models corresponding to six tumor regions and three tumor phenotypes were identified for further comparative analysis. In addition, we designed five experiments with different voxel spacing to assess the sensitivity of the experimental results to the spatial resolution of the voxels. Our results demonstrated that models based on 2D, 3D, and peritumoral region features yielded mean AUCs and 95% confidence intervals of 0.759 and [0.747–0.771] for lymphovascular invasion, 0.889 and [0.882–0.896] for pleural invasion, and 0.839 and [0.829–0.849] for T-staging in the testing cohort, which was significantly higher than all other models. Similar results were obtained for the model combining the three regional features at five voxel spacings. Our study revealed the predictive role of the developed methods with multi-regional features for the preoperative assessment of prognostic factors in NSCLC. The analysis of different voxel spacing and model interpretability strengthens the experimental findings and contributes to understanding the biological significance of the radiological phenotype.

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