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Clinical Trial
Journal Article
Research Support, U.S. Gov't, P.H.S.
Surgery and doxorubicin in dogs with hemangiosarcoma.
Journal of Veterinary Internal Medicine 1996 November
Forty-six dogs with histologically confirmed hemangiosarcoma of various locations other than skin were used in a prospective study to determine the efficacy of adjuvant doxorubicin (30 mg/m2 IV q 3 weeks for 5 treatments) 10 to 14 days after the tumor was partially or completely excised. Analysis of the data included information on variables that were hypothesized to influence response to therapy, disease-free interval (DFI), or survival time (ST). Other information collected included age, gender, breed, weight, prior therapy, type of surgery, location of the primary tumor, presence of metastases, number of doses of doxorubicin, response to doxorubicin therapy (complete or partial response), and the following histological criteria: overall differentiation, nuclear pleomorphism, percent necrosis, mitotic score, total histological score, and grade. Surgery outcome (complete versus incomplete surgical excision) markedly influenced survival times (P < .001). Twenty percent of the dogs rendered free of disease were alive at 1 year, whereas none of the dogs that had residual tumor after surgery were alive at 1 year. Most of the histological criteria (nuclear pleomorphism, mitotic score, grade, overall differentiation) had marked (P < .05), or close to marked, independent associations with ST for dogs that had complete tumor removal. Results from analysis of DFI were generally similar to those of ST in dogs with complete excision of the tumor. Twenty-seven of the 46 dogs (58.7%) had all clinical evidence of tumour successfully removed. Logistic regression analysis of surgical outcome (ability to remove all visible tumor) suggested that age of the subject was the only factor markedly influencing surgical outcome (P = .017). As age increased, the probability of success increased. Those dogs that had previous treatment for their hemangiosarcoma tended (P = .08) to have a shorter DFI and ST. Therefore, complete removal of all evidence of tumor followed by 5 doses of doxorubicin may be an effective treatment for dogs with hemangiosarcoma. Dogs that had all tumor successfully removed had a mean and median ST of 267 and 172 days, respectively. Dogs with incomplete tumor removal had a mean and median ST of 172 and 60 days, respectively. Similarly, prognostic variables such as the ability to completely excise all evidence of tumor, histological criteria, and age of the patient are potentially important prognostic variables for predicting outcome.
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