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Cancer Commun (Lond). 2020 Jan;40(1):16-24. doi: 10.1002/cac2.12002. Epub 2020 Mar 3.

Preoperative diagnosis of malignant pulmonary nodules in lung cancer screening with a radiomics nomogram.

Author information

1
Department of Pulmonary and Critical Care Medicine, Weihai Municipal Hospital, Weihai, Shandong, 264200, P. R. China.
2
Department of Biostatistics, School of Public Health, Shandong University, Jinan, Shandong, 250002, P. R. China.
3
Department of Physical Examination, Weihai Municipal Hospital, Weihai, Shandong, 264200, P. R. China.
4
Institute for Medical Dataology, Shandong University, Jinan, Shandong, 250002, P. R. China.

Abstract

BACKGROUND:

Lung cancer is the most commonly diagnosed cancer worldwide. Its survival rate can be significantly improved by early screening. Biomarkers based on radiomics features have been found to provide important physiological information on tumors and considered as having the potential to be used in the early screening of lung cancer. In this study, we aim to establish a radiomics model and develop a tool to improve the discrimination between benign and malignant pulmonary nodules.

METHODS:

A retrospective study was conducted on 875 patients with benign or malignant pulmonary nodules who underwent computed tomography (CT) examinations between June 2013 and June 2018. We assigned 612 patients to a training cohort and 263 patients to a validation cohort. Radiomics features were extracted from the CT images of each patient. Least absolute shrinkage and selection operator (LASSO) was used for radiomics feature selection and radiomics score calculation. Multivariate logistic regression analysis was used to develop a classification model and radiomics nomogram. Radiomics score and clinical variables were used to distinguish benign and malignant pulmonary nodules in logistic model. The performance of the radiomics nomogram was evaluated by the area under the curve (AUC), calibration curve and Hosmer-Lemeshow test in both the training and validation cohorts.

RESULTS:

A radiomics score was built and consisted of 20 features selected by LASSO from 1288 radiomics features in the training cohort. The multivariate logistic model and radiomics nomogram were constructed using the radiomics score and patients' age. Good discrimination of benign and malignant pulmonary nodules was obtained from the training cohort (AUC, 0.836; 95% confidence interval [CI]: 0.793-0.879) and validation cohort (AUC, 0.809; 95% CI: 0.745-0.872). The Hosmer-Lemeshow test also showed good performance for the logistic regression model in the training cohort (P = 0.765) and validation cohort (P = 0.064). Good alignment with the calibration curve indicated the good performance of the nomogram.

CONCLUSIONS:

The established radiomics nomogram is a noninvasive preoperative prediction tool for malignant pulmonary nodule diagnosis. Validation revealed that this nomogram exhibited excellent discrimination and calibration capacities, suggesting its clinical utility in the early screening of lung cancer.

KEYWORDS:

computed tomography; early screening; lung cancer; nomogram; pulmonary nodule; radiomics

PMID:
32125097
DOI:
10.1002/cac2.12002
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