Peer-reviewed veterinary case report
Survival after spaying and mastectomy in dogs with mammary tumors
By Banchi, Penelope et al.·Published in Veterinary and comparative oncology·2022·Department of Veterinary Sciences, Italy·View original on PubMed →
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Original publication title: A retrospective study and survival analysis on bitches with mammary tumours spayed at the same time of mastectomy.
Plain-English summary
A group of female dogs with mammary tumors underwent surgery to remove the tumors, and some were also spayed at the same time. The results showed that dogs who were spayed during the surgery had a longer disease-free survival compared to those who were not spayed. Tumor size was also affected by whether the dog was spayed, with spayed dogs having larger tumors on average. This suggests that spaying may be beneficial for dogs with mammary tumors, and owners should discuss this option with their veterinarian when planning surgery.
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Abstract
The aim of the present study was to retrospectively assess whether spaying at the same time of mastectomy increased disease-free survival (DFS) in bitches with mammary tumours and to investigate the utility of clinical data when designing a surgical plan that includes gonadectomy. Characteristics of 225 bitches carrying 489 tumours were retrieved. Of the116 bitches that underwent surgery, 52 bitches underwent mastectomy and ovariectomy, 46 bitches underwent mastectomy alone, whereas 18 bitches were already spayed. Analysis by Kaplan-Meier and in-between groups comparisons using Student's T, Chi-square, and one-way ANOVA tests were performed. DFS was longer for bitches that underwent ovariectomy and mastectomy compared to those that were left intact (p = .00064) or were already spayed (p = .0098). Spaying status affected tumour size (spayed: 2.75 cm ± 2.72; intact: 1.76 cm ± 2.04; p = .039), but not malignancy (p > .05). Differences in age were detected between animals with benign and malignant tumours (years: 9.1 ± 2.8 and 10 ± 2.3; p = .004), with multiple and single tumours (years: 10.18 ± 2.6 and 9.3 ± 2.8; p = .007), and between purebred and mixed breed bitches (years: 10.46 ±1.78 and 9.27 ±2.68; p = .005). Malignant tumours were larger than benign ones (2.17 cm±2.31 and 1.34 cm ±1.82; p = .005) and size increased according to the degree of malignancy. DFS was shorter for animals presenting tumours >2 cm in size (p < .006) and with tumours in the first pair of thoracic mammary glands (p = .00009). Gonadectomy should be suggested to owners of intact bitches carrying mammary tumours and age, size of the tumour, and location should be carefully considered when performing surgery.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/34351034/