Seventeen horses with a total of 18 ocular or periorbital squamous cell carcinomas were irradiated with strontium-90 surface therapy, or radon-222, iodine-125, or iridium-192 interstitial implants. Tumours were surgically cytoreduced before irradiation in all but two horses. Follow-up studies were carried out for 2 years in each horse. Two-year non-recurrence rates (no grossly visible evidence of tumour) were 87.5% for 90Sr β therapy, and 60% (70% when corrected for non-tumour-related deaths) for interstitial implant therapy. Data regarding frequency of occurrence, location of lesions, age of onset, and non-recurrence rates were similar to previous literature reports using variable or shorter follow-up periods. The effects of cytoreductive surgery of the tumours was not studied.
Available at: http://works.bepress.com/dennis_geiser/22/