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Radiation-induced endometriosis in Macaca mulatta
1Veterinary Sciences Division, USAF School of Aerospace Medicine, Brooks AFB, Texas 78235.
Radiation Research
|May 1, 1991
Summary
Ionizing radiation exposure, including protons and X rays, significantly increased endometriosis incidence in female rhesus monkeys. This study highlights radiation as a risk factor for developing endometriosis.
Area of Science:
- Radiation oncology
- Gynecologic pathology
- Primate research
Background:
- Endometriosis is a common gynecologic condition with multifactorial etiology.
- The potential role of environmental factors, such as radiation exposure, in endometriosis development remains under investigation.
Purpose of the Study:
- To investigate the incidence and characteristics of endometriosis in female rhesus monkeys following whole-body exposure to various types of ionizing radiation.
- To compare endometriosis rates between irradiated and non-irradiated control groups.
Main Methods:
- Female rhesus monkeys were administered whole-body doses of single-energy protons, mixed-energy protons, X rays, or electrons.
- Monkeys were monitored for 17 years post-exposure for the development of endometriosis.
- Incidence, severity, clinical signs, pathological lesions, and treatment outcomes were recorded and analyzed.
Main Results:
- Endometriosis developed in 53% of irradiated monkeys versus 26% in controls.
- Significantly higher incidence rates were observed for single-energy protons (54%), mixed-energy protons (73%), and X rays (71%) compared to controls (P < 0.05).
- Common pathological findings included endometrial cysts (69%), adhesions (up to 86%), and omental nodules (59%); 9% showed metastasis.
Conclusions:
- Whole-body exposure to ionizing radiation, particularly protons and X rays, is associated with a significantly increased risk of developing endometriosis in female rhesus monkeys.
- The study identifies radiation as a potential risk factor and provides insights into the clinical and pathological manifestations of radiation-induced endometriosis.