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Volume effects in rhesus monkey spinal cord

T E Schultheiss¹, L C Stephens, K K Ang

¹Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA 19111.

International Journal of Radiation Oncology, Biology, Physics

|April 30, 1994

Summary

This study shows that spinal cord radiation myelopathy in Rhesus monkeys exhibits a volume effect, influenced by radiation field size. The Rhesus monkey is a relevant model for human radiation myelopathy studies.

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Area of Science:

Radiation oncology
Neuroscience
Animal models in research

Background:

Radiation myelopathy is a serious dose-limiting toxicity in radiotherapy of the spine.
Understanding the factors influencing radiation myelopathy is crucial for optimizing treatment plans.
The existence and extent of a volume effect in radiation myelopathy have been debated.

Purpose of the Study:

To investigate the presence and characteristics of a volume effect in radiation myelopathy.
To evaluate the Rhesus monkey as an animal model for radiation myelopathy.

Main Methods:

Rhesus monkeys were irradiated with clinically relevant field sizes (4, 8, and 16 cm) and fractionation schedules (2.2 Gy/fraction).
Dose-response relationships were analyzed using maximum likelihood estimation and a logistic dose-response function.

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A probability model was employed to quantify the volume effect.

Main Results:

The probability model effectively described the observed data, indicating a volume effect in radiation myelopathy.
No significant differences in spinal cord sensitivity were observed across different anatomical levels.
Lesion types and latent periods in Rhesus monkeys closely resembled those seen in human radiation myelopathy.

Conclusions:

The spinal cord demonstrates a volume effect in radiation myelopathy, well-characterized by the probability model.
The volume effect is modest due to a steep dose-response curve for radiation myelopathy.
Rhesus monkeys serve as a valuable preclinical model for studying radiation myelopathy due to similarities with human responses.