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Circulating microRNAs as biomarkers of radiation-induced cardiac toxicity in non-small-cell lung cancer

  • Original Article – Clinical Oncology
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Journal of Cancer Research and Clinical Oncology Aims and scope Submit manuscript

Abstract

Purpose

Radiation-induced cardiac toxicity (RICT) is an increasingly well-appreciated source of morbidity and mortality in patients receiving thoracic radiotherapy (RT). Currently available methods to predict RICT are suboptimal. We investigated circulating microRNAs (c-miRNAs) as potential biomarkers of RICT in patients undergoing definitive RT for non-small-cell lung cancer (NSCLC).

Methods

Data from 63 patients treated on institutional trials were analyzed. Prognostic models of grade 3 or greater (G3 +) RICT based on pre-treatment c-miRNA levels (‘c-miRNA’), mean heart dose (MHD) and pre-existing cardiac disease (PCD) (‘clinical’), and a combination of these (‘c-miRNA + clinical’) were developed. Elastic net Cox regression and full cross validation were used for variable selection, model building, and model evaluation. Concordance statistic (c-index) and integrated Brier score (IBS) were used to evaluate model performance.

Results

MHD, PCD, and serum levels of 14 c-miRNA species were identified as jointly prognostic for G3 + RICT. The ‘c-miRNA and ‘clinical’ models yielded similar cross-validated c-indices (0.70 and 0.72, respectively) and IBSs (0.26 and 0.28, respectively). However, prognostication was not improved by combining c-miRNA and clinical factors (c-index 0.70, IBS 0.28). The ‘c-miRNA’ and ‘clinical’ models were able to significantly stratify patients into high- and low-risk groups of developing G3 + RICT. Chi-square testing demonstrated a marginally significantly higher prevalence of PCD in patients with high- compared to low-risk c-miRNA profile (p = 0.09), suggesting an association between some c-miRNAs and PCD.

Conclusions

We identified a pre-treatment c-miRNA signature prognostic for G3 + RICT. With further development, pre- and mid-treatment c-miRNA profiling could contribute to patient-specific dose selection and treatment adaptation.

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Funding

This work was supported in part by R0 1CA142840 (Kong) and P01 CA059827 (Ten Haken and Lawrence).

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Correspondence to Shruti Jolly.

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Conflict of interest

The authors declare no conflicts of interest relevant to this work.

Ethics approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Institutional Review Board of the University of Michigan. This article does not contain studies with animals performed by any of the authors.

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Informed consent was obtained from all individual participants included in the study.

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Hawkins, P.G., Sun, Y., Dess, R.T. et al. Circulating microRNAs as biomarkers of radiation-induced cardiac toxicity in non-small-cell lung cancer. J Cancer Res Clin Oncol 145, 1635–1643 (2019). https://doi.org/10.1007/s00432-019-02903-5

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  • DOI: https://doi.org/10.1007/s00432-019-02903-5

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