What Researchers Did
Researchers characterized the radiation dose-response of the human spinal cord by combining data from various published reports.
What They Found
They estimated the median tolerance dose for the cervical cord to be 69.4 Gy (95% CI, 66.4-72.6) with an alpha/beta ratio of 0.87 Gy. The extrapolated probability of myelopathy was 0.03% at 45 Gy and 0.2% at 50 Gy, with a 5% myelopathy rate occurring at 59.3 Gy.
What This Means for Canadian Patients
These findings provide important dose-response data for radiation therapy planning, helping to minimize the risk of spinal cord myelopathy in patients undergoing treatment. Understanding these thresholds can guide oncologists in optimizing radiation doses to effectively treat cancer while protecting the spinal cord from damage.
Canadian Relevance
This study has no specific Canadian connection.
Study Limitations
A limitation is that the study combined data from various published reports, and an adequate fit to thoracic spinal cord data was not possible.