Peer-reviewed veterinary case report
Survival factors after malignant mammary tumor surgery in female dogs
By Chang, Shih-Chieh et al.·Published in Journal of the American Veterinary Medical Association·2005·Department of Veterinary Medicine·View original on PubMed →
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Original publication title: Prognostic factors associated with survival two years after surgery in dogs with malignant mammary tumors: 79 cases (1998-2002).
- Species:
- dog
Plain-English summary
A group of 79 female dogs with malignant mammary tumors underwent surgery to remove the tumors, and researchers looked at factors that could affect their survival two years later. They found that larger tumors (5 cm or more) and those that had been present for over six months were more likely to spread to nearby lymph nodes. Additionally, dogs that had an ovariohysterectomy (spay surgery) showed better survival rates, especially if they had complex tumors. Overall, the size of the tumor, its stage, and whether the dog had been spayed were important factors in predicting how long the dogs would live after surgery.
People also search for: dog mammary tumor prognosis · spaying benefits for dogs with tumors · malignant mammary tumors in dogs treatment
Abstract
OBJECTIVE: To identify prognostic factors for female dogs that have undergone surgical removal of malignant mammary tumors. DESIGN: Retrospective case series. ANIMALS: 79 female dogs with malignant mammary tumors. PROCEDURE: Information obtained from the medical records included breed, age, sex, tumor size (maximum diameter), number and location of affected mammary glands, time between tumor identification and surgical removal, radiographic evidence of distant metastasis, surgical procedure, ovariohysterectomy (OHE) status, histologic classification of the tumor, and survival time. RESULTS: Results of univariate analyses indicated that clinical stage, tumor size, OHE status, metastasis to adjacent lymph nodes or distant sites, and histologic classification of the tumor were significantly associated with survival 2 years after surgery. Tumors > or = 5 cm in diameter and tumors that had been identified > 6 months before surgery were more likely to metastasize to adjacent lymph nodes. Ovariohysterectomy was more beneficial in dogs with complex carcinomas than in dogs with simple carcinomas. In multivariate analyses, clinical stage, tumor size, and OHE status were significantly associated with survival 2 years after surgery. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that tumor stage, tumor size, and OHE status were significant prognostic factors associated with survival 2 years after surgery in dogs with malignant mammary tumors. Further, either dogs with tumors > or = 5 cm in diameter or dogs with tumors present for > 6 months prior to surgery had a higher risk of having lymph node metastases.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/16313041/