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AN ACCELERATED TECHNIQUE FOR IRRADIATION OF MALIGNANT CANINE NASAL AND PARANASAL SINUS TUMORS
Author(s) -
Adams William M.,
Miller Paul E.,
Vail David M.,
Forrest Lisa J.,
MacEwen E. Gregory
Publication year - 1998
Publication title -
veterinary radiology and ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.541
H-Index - 60
eISSN - 1740-8261
pISSN - 1058-8183
DOI - 10.1111/j.1740-8261.1998.tb01637.x
Subject(s) - medicine , radiation therapy , osteoradionecrosis , histology , surgery , survival rate , survival analysis , sinus (botany) , botany , biology , genus
Tumor and normal tissue response was assessed in 21 dogs with malignant nasal tumors given 42 Gy cobalt radiation in 9 or 10 fractions over 11 to 13 days. Local tumor/clinical relapse recurred in 68% of dogs, with a median relapse free interval (RFI) of 270 days. Median survival was 428 days. One year survival for all dogs was 60%. RFI and survival times are better than, or similar to, previous reports of dogs treated with radiotherapy only. Acute radiation effects were severe in one dog. Late effects were severe in six of 15 dogs (40%) with durable tumor control. Late effects included bilateral blindness (3), osteoradionecrosis (3), and seizures (1). These six dogs had a median survival of 705 days. Loss of vision occurred in at least one eye in nine dogs (47%). Tumor staging based on CT findings were predictive for survival duration. Tumor histology was not predictive of outcome. Labrador Retrievers were significantly over‐represented. Despite comparable or improved tumor control and survival times provided by this accelerated protocol, relative to other radiotherapy reports, local failure remains the major cause of death, and late radiation effects can be severe in dogs with durable tumor control.