Receptor Profiles in Dog Mammary Tissue
Author Information
Author(s): G.R. Rutteman, W. Misdorp, M.A. Blankenstein, W.E. van den Brom
Primary Institution: Small Animal Clinic, Faculty of Veterinary Medicine; Department of Endocrinology, University Hospital, State University, Utrecht; Division of Clinical Oncology, Netherlands Cancer Institute, Amsterdam
Hypothesis
What are the estrogen and progestin receptor profiles in non-malignant and malignant mammary tissues of female dogs?
Conclusion
Non-malignant mammary tissues in female dogs frequently express estrogen and progestin receptors, while these receptors are less common in malignant tumors.
Supporting Evidence
- ER and PR levels were higher in normal tissues and benign lesions than in primary cancers.
- ER and PR positivity was more frequent in benign lesions of dogs that later developed malignant tumors.
- Regional and distant cancer metastases were frequently receptor-negative.
Takeaway
This study looked at how certain hormone receptors are found in the breast tissues of female dogs. It found that healthy tissues usually have these receptors, but cancerous tissues often do not.
Methodology
Receptor levels were measured in cytosols from normal, benign, and malignant mammary tissues obtained from female dogs.
Potential Biases
Receptor results may be biased due to the presence of normal tissue in tumor samples.
Limitations
The presence of normal mammary epithelium in tumor specimens may lead to false-positive receptor results.
Participant Demographics
Female dogs of various breeds, aged 3-12 years.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
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