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A predictive nomogram for two-year growth of CT-indeterminate small pulmonary nodules

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Abstract

Objectives

Lung cancer is the most common cancer and the leading cause of cancer-related death worldwide. The optimal management of computed tomography (CT)-indeterminate pulmonary nodules is important. To optimize individualized follow-up strategies, we developed a radiomics nomogram for predicting 2-year growth in case of indeterminate small pulmonary nodules.

Methods

A total of 215 histopathology-confirmed small pulmonary nodules (21 benign and 194 malignant) in 205 patients with ultra-high-resolution CT (U-HRCT) were divided into growth and nongrowth nodules and were randomly allocated to the primary (n = 151) or validation (n = 64) group. The least absolute shrinkage and selection operator (LASSO) method was used for radiomics feature selection and radiomics signature determination. Multivariable logistic regression analysis was used to develop a radiomics nomogram that integrated the radiomics signature with significant clinical parameters (sex and nodule type). The area under the curve (AUC) was applied to assess the predictive performance of the radiomics nomogram. The net benefit of the radiomics nomogram was assessed using a clinical decision curve.

Results

The radiomics signature and nomogram yielded AUCs of 0.892 (95% confidence interval [CI]: 0.843–0.940) and 0.911 (95% CI: 0.867–0.955), respectively, in the primary group and 0.826 (95% CI: 0.727–0.926) and 0.843 (95% CI: 0.749–0.937), respectively, in the validation group. The clinical usefulness of the nomogram was demonstrated by decision curve analysis.

Conclusions

A radiomics nomogram was developed by integrating the radiomics signature with clinical parameters and was easily used for the individualized prediction of two-year growth in case of CT-indeterminate small pulmonary nodules.

Key Points

A radiomics nomogram was developed for predicting the two-year growth of CT-indeterminate small pulmonary nodules.

The nomogram integrated a CT-based radiomics signature with clinical parameters and was valuable in developing an individualized follow-up strategy for patients with indeterminate small pulmonary nodules.

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Abbreviations

AIC:

Akaike information criterion

CDC:

Clinical decision curve

CI:

Confidence interval

FOV:

Field of view

GGN:

Ground-glass nodule

LASSO:

Least absolute shrinkage and selection operator

U-HRCT:

Ultra-high-resolution computed tomography

VDT:

Volume-doubling time

VOI:

Volume of interest

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Funding

This work has received funding from Shanghai Chest Hospital (No. 2019YNJCQ02), Shanghai Municipal Health Commission (No. ZK2019B01), National Natural Science Foundation of China (No. 82071873, 81871353), and Science and Technology Commission of Shanghai Xuhui District Municipality (No. 2020–010).

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Corresponding authors

Correspondence to Hong Yu or Jin Wei Qiang.

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Guarantor

The scientific guarantor of this publication is Jinwei Qiang.

Conflict of interest

The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Statistics and biometry

Ying Li has significant statistical expertise.

Informed consent

Written informed consent was obtained from all patients in this study.

Ethical approval

Institutional Review Board approval was obtained by Shanghai Chest Hospital.

Study subjects or cohorts overlap

No study subjects or cohorts overlap.

Methodology

• retrospective

• diagnostic or prognostic study

• performed at one institution

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Cite this article

Xue, L.M., Li, Y., Zhang, Y. et al. A predictive nomogram for two-year growth of CT-indeterminate small pulmonary nodules. Eur Radiol 32, 2672–2682 (2022). https://doi.org/10.1007/s00330-021-08343-5

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  • DOI: https://doi.org/10.1007/s00330-021-08343-5

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