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Radiation dose response of neurologic symptoms during conformal radiotherapy for diffuse intrinsic pontine glioma

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Abstract

Purpose

To estimate the rate and magnitude of neurologic symptom change during radiation therapy (RT) and impact of symptom change on survival outcomes in patients with diffuse intrinsic pontine glioma (DIPG).

Methods

From 2006 to 2014, 108 patients with newly diagnosed DIPG were treated with conventionally fractionated radiation therapy (RT) to 54 Gy (median) at our institution. The presence and severity of neurologic symptoms related to cranial neuropathy (CN) and cerebellar (CB) and long-tract (LT) signs was reviewed before and weekly during RT for each patient. The rate and magnitude of change for each symptom category was evaluated according to accumulated RT dose. The impact of clinical factors and radiation dose-volume parameters was determined using Cox proportional hazards models.

Results

Median dose to first sign of symptomatic improvement was 16.2 Gy (CN), 19.8 Gy (LT) and 21.6 Gy (CB). Most patients showed an improvement by 20 Gy. Larger uninvolved brainstem volume, alone or normalized to total brain (TB) or posterior fossa volume (PF), was associated with shorter time to LT sign improvement (P = 0.044, P = 0.033, and P = 0.05, respectively). Patients with any improvement in CN experienced significantly, yet modestly, prolonged progression-free survival (PFS) and overall survival (OS) (P = 0.002 and P = 0.008, respectively). Tumor volume, with or without normalization to TB or PF, was not significantly associated with PFS or OS.

Conclusions

Low cumulative RT doses resulted in neurologic improvement in most patients with DIPG. The volume of brainstem spared by tumor influenced time to symptomatic improvement. Neurologic improvement during RT was associated with superior survival.

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Acknowledgements

The authors would like to thank Keith A. Laycock, PhD, ELS, for scientific editing of the manuscript.

Funding

This work was supported in part by the American Lebanese Syrian Associated Charities (ALSAC), the National Cancer Institute grant P30 CA021765 (St. Jude Cancer Center Support Grant), and the Dunagan MD Medical Education Fund (to K.C.). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health

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Correspondence to Christopher L. Tinkle.

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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. For this type of study formal consent is not required.

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Tinkle, C.L., Campbell, K., Han, Y. et al. Radiation dose response of neurologic symptoms during conformal radiotherapy for diffuse intrinsic pontine glioma. J Neurooncol 147, 195–203 (2020). https://doi.org/10.1007/s11060-020-03415-w

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  • DOI: https://doi.org/10.1007/s11060-020-03415-w

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