Postoperative hypofractionated radiotherapy for canine soft tissue sarcomas of limbs:a retrospective study of 14 cases

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Postoperative hypofractionated radiotherapy was given to 14 canine cases with soft tissue sarcomas of limbs, and treatment outcomes and radiation injury were retrospectively analyzed in cases followed-up for 1 year or longer after the termination of the therapy. The recurrence rate was 7.1% and various degrees of radiation injury were observed in 85.7% , but no severe injury has been observed to date. The 1-, 2-, and 3-year survival rates were 100, 92.9, and 66.7% , respectively. The tumor control rates were 85.7, 71.4, and 57.1% , after 1, 2 and 3 years, respectively. The overall treatment outcomes of postoperative hypofractionated radiotherapy for canine soft tissue sarcomas in limbs were similar to conventinal radiotherapy, but not enough for small cases. Hypofractionation appears to be a useful irradiation method for reducing the risk of anesthesia and burden on the animal and owner.