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Sarcoma development after radiotherapy in two dogs.

R J Mellanby1, M E Herrtage, J Chantry

  • 1Queen's Veterinary School Hospital, University of Cambridge, Cambridge, UK. rjm69@cam.ac.uk

Veterinary and Comparative Oncology
|April 22, 2009
PubMed
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Hypofractionated radiotherapy for canine tumors may lead to bone sarcomas years later. This study reports two cases of appendicular bone sarcomas developing at irradiated sites in dogs, highlighting a rare but serious long-term side effect.

Area of Science:

  • Veterinary Oncology
  • Radiation Oncology
  • Canine Cancer Research

Background:

  • Bone sarcomas are a recognized late side effect of radiotherapy in humans.
  • Such tumors have been infrequently reported in canine patients.
  • Hypofractionated radiotherapy involves fewer, larger radiation doses.

Purpose of the Study:

  • To report the development of bone sarcomas in dogs following hypofractionated radiotherapy.
  • To describe the occurrence of appendicular skeletal sarcomas at previously irradiated sites.
  • To contribute to the understanding of long-term radiotherapy side effects in veterinary medicine.

Main Methods:

  • Case report of two dogs treated with hypofractionated radiotherapy.
  • Surgical excision of mast cell tumor and round cell tumor respectively.

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  • Long-term follow-up to monitor for delayed adverse effects.

    • Main Results:

    • Both dogs developed bone sarcomas within the irradiated field years after treatment.
    • The sarcomas occurred in the appendicular skeleton.
    • This represents a rare complication of hypofractionated radiation therapy in dogs.

    Conclusions:

    • Hypofractionated radiotherapy, while effective for tumor treatment, carries a risk of secondary bone sarcoma development in dogs.
    • These findings underscore the importance of long-term surveillance for canine patients treated with radiation.
    • Further research is needed to elucidate the mechanisms and incidence of radiation-induced sarcomas in dogs.