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Is FDG-PET texture analysis related to intratumor biological heterogeneity in lung cancer?

  • Molecular Imaging
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A Correction to this article was published on 23 December 2020

This article has been updated

Abstract

Objectives

We aimed at investigating the origin of the correlations between tumor volume and 18F-FDG-PET texture indices in lung cancer.

Methods

Eighty-five consecutive patients with newly diagnosed non-small cell lung cancer (NSCLC) underwent a 18F-FDG-PET/CT scan before treatment. Seven phantom spheres uniformly filled with 18F-FDG, and covering a range of activities and volumes similar to that found in lung tumors, were also scanned. Established texture indices were computed for lung tumors and homogeneous spheres. The dependence between textural indices and volume in homogeneous spheres was modeled and then used to predict texture indices in lung tumors. Correlation analyses were carried out between predicted and texture features measured in lung tumors. Cox proportional hazards regression was used to investigate the associations between overall survival and volume-adjusted textural features.

Results

All textural features showed strong, non-linear correlations with volume, both in tumors and homogeneous spheres. Correlations between predicted versus measured texture features were very high for contrast (r2 = 0.91), dissimilarity (r2 = 0.90), ZP (r2 = 0.90), GLNN (r2 = 0.86), and homogeneity (r2 = 0.82); high for entropy (r2 = 0.50) and HILAE (r2 = 0.53); and low for energy (r2 = 0.30). Cox regressions showed that among volume-adjusted features, only HILAE was associated with overall survival (b = − 0.35, p = 0.008).

Conclusion

We have shown that texture indices previously found to be correlated with a number of clinically relevant outcomes might not provide independent information apart from that driven by their correlation with tumor volume, suggesting that these metrics might not be suitable as intratumor heterogeneity markers.

Key Points

Associations between texture FDG-PET indices and overall survival have been widely reported in lung cancer, with tumor volume also being associated with overall survival, and therefore, it is still unclear whether the predictive power of textural indices is simply driven by this correlation.

Our results demonstrated strong non-linear correlations between textural indices and volume, showing an analogous behavior for lung tumors from patients and homogeneous spheres inserted in phantoms.

Our findings showed that texture FDG-PET indices might not provide independent information apart from that driven by their correlation with tumor volume.

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Abbreviations

CM:

Co-occurrence matrix

GLNN:

Gray Level Non-Uniformity Normalized

HILAE:

High intensity large area emphasis

NSCLC:

Non-small lung cell carcinoma

SZM:

Size zone matrix

ZP:

Zone percentage

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Acknowledgments

Special thanks to the technical staff of the Nuclear Medicine Department, who provided all the required information on the acquisition and reconstruction protocol and management of patients.

Funding

This study has received funding by the public project DTS17/00138 co-funded by FEDER and Beca SEMNIM 2020 (con el patrocinio de Advanced Accelerator Applications).

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Correspondence to Pablo Aguiar.

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The scientific guarantor of this publication is Pablo Aguiar.

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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.

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AM-R has significant statistical expertise.

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

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Institutional Review Board approval was obtained.

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• performed at one institution

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The original online version of this article was revised: The information that Manuel Piñeiro-Fiel and Alexis Moscoso have contributed equally to this work was missing.

Manuel Piñeiro-Fiel and Alexis Moscoso contributed equally to this work.

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Piñeiro-Fiel, M., Moscoso, A., Lado-Cacheiro, L. et al. Is FDG-PET texture analysis related to intratumor biological heterogeneity in lung cancer?. Eur Radiol 31, 4156–4165 (2021). https://doi.org/10.1007/s00330-020-07507-z

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