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Cataractogenesis after Cobalt-60 eye plaque radiotherapy
M Kleineidam1, J J Augsburger, C Hernandez
1Oncology Unit, Wills Eye Hospital, Jefferson Medical College, Philadelphia, PA 19107.
Summary
Radiation dose alone did not predict post-irradiation cataracts in uveal melanoma patients. Tumor characteristics and plaque size were better predictors of cataract development after Cobalt-60 radiotherapy.
Area of Science:
- Ophthalmology
- Radiation Oncology
- Medical Physics
Background:
- Posterior uveal melanoma is a rare eye cancer.
- Cobalt-60 plaque radiotherapy is a common treatment for this condition.
- Cataract formation is a known side effect of radiation therapy to the eye.
Purpose of the Study:
- To estimate the incidence of post-irradiation cataracts after Cobalt-60 plaque radiotherapy for uveal melanoma.
- To identify factors predicting cataract development, focusing on radiation dose and dose-rate to the lens.
Main Methods:
- Actuarial analysis of cataract occurrence in 365 patients treated between 1976 and 1986.
- Multivariate Cox proportional hazards modeling to identify predictive factors.
Main Results:
- 22% of patients developed visually significant cataracts within 5 years with a lens dose of 6-20 Gy.
- Tumor thickness, anterior margin location, and plaque diameter predicted cataract development.
- Radiation dose to the lens was not a significant predictor in multivariate analysis.
Conclusions:
- Predicting and potentially mitigating post-irradiation cataracts in uveal melanoma patients may be limited by current treatment planning.
- Further research into optimizing radiotherapy techniques is warranted.