A portion of this work was presented as an oral abstract at the Veterinary Cancer Society's annual conference, Albuquerque, New Mexico (November 5, 2011)
Intensity-Modulated and Image-Guided Radiation Therapy for Treatment of Genitourinary Carcinomas in Dogs
Article first published online: 25 MAY 2012
Copyright © 2012 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 26, Issue 4, pages 987–995, July-August 2012
How to Cite
Nolan, M.W., Kogan, L., Griffin, L.R., Custis, J.T., Harmon, J.F., Biller, B.J. and LaRue, S.M. (2012), Intensity-Modulated and Image-Guided Radiation Therapy for Treatment of Genitourinary Carcinomas in Dogs. Journal of Veterinary Internal Medicine, 26: 987–995. doi: 10.1111/j.1939-1676.2012.00946.x
- Issue published online: 13 JUL 2012
- Article first published online: 25 MAY 2012
- Manuscript Accepted: 17 APR 2012
- Manuscript Revised: 24 FEB 2012
- Manuscript Received: 20 JAN 2012
External beam radiation therapy can be used to treat pelvic tumors in dogs, but its utility is limited by lack of efficacy data and associated late complications.
The objective of this study was to assess local tumor control, overall survival, and toxicosis after intensity-modulated and image-guided radiation therapy (IM/IGRT) for treatment of genitourinary carcinomas (CGUC) in dogs.
21 client-owned dogs.
A retrospective study was performed. Medical records of dogs for which there was intent to treat with a course of definitive-intent IM/IGRT for CGUC between 2008 and 2011 were reviewed. Descriptive and actuarial statistics comprised the data analysis.
Primary tumors were located in the prostate (10), urinary bladder (9), or urethra (2). The total radiation dose ranged from 54–58 Gy, delivered in 20 daily fractions. Grade 1 and 2 acute gastrointestinal toxicoses developed in 33 and 5% of dogs, respectively. Grade 1 and 2 acute genitourinary and grade 1 acute integumentary toxicoses were documented in 5, 5, and 20% of dogs, respectively. Four dogs experienced late grade 3 gastrointestinal or genitourinary toxicosis. The subjective response rate was 60%. The median event-free survival was 317 days; the overall median survival time was 654 days. Neither local tumor control nor overall survival was statistically dependent upon location of the primary tumor.
Conclusions and Clinical Importance
IM/IGRT is generally well-tolerated and provides an effective option for locoregional control of CGUC. As compared with previous reports in the veterinary literature, inclusion of IM/IGRT in multimodal treatment protocols for CGUC can result in superior survival times; controlled prospective evaluation is warranted.