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Deep learning signatures reveal multiscale intratumor heterogeneity associated with biological functions and survival in recurrent nasopharyngeal carcinoma

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European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

How to discriminate different risks of recurrent nasopharyngeal carcinoma (rNPC) patients and guide individual treatment has become of great importance. This study aimed to explore the associations between deep learning signatures and biological functions as well as survival in (rNPC) patients.

Methods

A total of 420 rNPC patients with PET/CT imaging and follow-up of overall survival (OS) were retrospectively enrolled. All patients were randomly divided into a training set (n = 269) and test set (n = 151) with a 6:4 ratio. We constructed multi-modality deep learning signatures from PET and CT images with a light-weighted deep convolutional neural network EfficienetNet-lite0 and survival loss DeepSurvLoss. An integrated nomogram was constructed incorporating clinical factors and deep learning signatures from PET/CT. Clinical nomogram and single-modality deep learning nomograms were also built for comparison. Furthermore, the association between biological functions and survival risks generated from an integrated nomogram was analyzed by RNA sequencing (RNA-seq).

Results

The C-index of the integrated nomogram incorporating age, rT-stage, and deep learning PET/CT signature was 0.741 (95% CI: 0.688–0.794) in the training set and 0.732 (95% CI: 0.679–0.785) in the test set. The nomogram stratified patients into two groups with high risk and low risk in both the training set and test set with hazard ratios (HR) of 4.56 (95% CI: 2.80–7.42, p < 0.001) and 4.05 (95% CI: 2.21–7.43, p < 0.001), respectively. The C-index of the integrated nomogram was significantly higher than the clinical nomogram and single-modality nomograms. When stratified by sex, N-stage, or EBV DNA, risk prediction of our integrated nomogram was valid in all patient subgroups. Further subgroup analysis showed that patients with a low-risk could benefit from surgery and re-irradiation, while there was no difference in survival rates between patients treated by chemotherapy in the high-risk and low-risk groups. RNA sequencing (RNA-seq) of data further explored the mechanism of high- and low-risk patients from the genetic and molecular level.

Conclusion

Our study demonstrated that PET/CT-based deep learning signatures showed satisfactory prognostic predictive performance in rNPC patients. The nomogram incorporating deep learning signatures successfully divided patients into different risks and had great potential to guide individual treatment: patients with a low-risk were supposed to be treated with surgery and re-irradiation, while for high-risk patients, the application of palliative chemotherapy may be sufficient.

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Acknowledgements

The authors thank Prof. Xuebin Xie from KiangWu Hospital, Macau, China for his great help about the clinical part in this paper.

Funding

This work was supported by the Strategic Priority Research Program of Chinese Academy of Sciences (XDB38040200), National Key R&D Program of China (2017YFA0205200, 2017YFC0908500, 2017YFC1309003), National Natural Science Foundation of China (82022036, 91959130, 81971776, 81771924, 62027901, 81930053, 81425018, 81672868, 81802775, 82073003, 82002852, 82003267, 81803105), the Beijing Natural Science Foundation (L182061), the Youth Innovation Promotion Association CAS (Y2021049, 2017175), the Sci-Tech Project Foundation of Guangzhou City (201707020039), the Sun Yat-sen University Clinical Research 5010 Program (2016010, 201315, 2015021, 2017010, 2016013, 2019023), Innovative research team of high-level local universities in Shanghai (SSMU-ZLCX20180500), the Natural Science Foundation of Guangdong Province (2017A030312003, 2018A0303131004), the Natural Science Foundation of Guangdong Province for Distinguished Young Scholar (2018B030306001), the Health & Medical Collaborative Innovation Project of Guangzhou City (No. 201803040003), Pearl River S&T Nova Program of Guangzhou (201806010135), the Planned Science and Technology Project of Guangdong Province (2019B020230002), Natural Science Foundation of Guangdong Province (2017A030312003), the Key Youth Teacher Cultivating Program of Sun Yat-sen University (20ykzd24), and the Fundamental Research Funds for the Central Universities.

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Correspondence to Lin-Quan Tang, Di Dong, Jie Tian or Hai-Qiang Mai.

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All procedures performed in the study and involving human participants were carried out in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

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The ethical review board of each participating center approved this retrospective study and waived the requirement of informed consent.

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The authors declare no competing interests.

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This article is part of the Topical Collection on Oncology—Head and Neck.

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Zhao, X., Liang, YJ., Zhang, X. et al. Deep learning signatures reveal multiscale intratumor heterogeneity associated with biological functions and survival in recurrent nasopharyngeal carcinoma. Eur J Nucl Med Mol Imaging 49, 2972–2982 (2022). https://doi.org/10.1007/s00259-022-05793-x

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