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Int J Radiat Oncol Biol Phys. 2010 Mar 1;76(3 Suppl):S42-9. doi: 10.1016/j.ijrobp.2009.04.095.

Radiation dose-volume effects in the spinal cord.

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1
Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA. jkirk@radonc.duke.edu

Abstract

Dose-volume data for myelopathy in humans treated with radiotherapy (RT) to the spine is reviewed, along with pertinent preclinical data. Using conventional fractionation of 1.8-2 Gy/fraction to the full-thickness cord, the estimated risk of myelopathy is <1% and <10% at 54 Gy and 61 Gy, respectively, with a calculated strong dependence on dose/fraction (alpha/beta = 0.87 Gy.) Reirradiation data in animals and humans suggest partial repair of RT-induced subclinical damage becoming evident about 6 months post-RT and increasing over the next 2 years. Reports of myelopathy from stereotactic radiosurgery to spinal lesions appear rare (<1%) when the maximum spinal cord dose is limited to the equivalent of 13 Gy in a single fraction or 20 Gy in three fractions. However, long-term data are insufficient to calculate a dose-volume relationship for myelopathy when the partial cord is treated with a hypofractionated regimen.

PMID:
20171517
DOI:
10.1016/j.ijrobp.2009.04.095
[Indexed for MEDLINE]
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