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The dog as a naturally-occurring model for insulin-like growth factor type 1 receptor-overexpressing breast cancer: an observational cohort study.
- Source :
- BMC Cancer; 10/9/2015, Vol. 15 Issue 1, p1-13, 13p, 1 Color Photograph, 5 Charts, 1 Graph
- Publication Year :
- 2015
-
Abstract
- <bold>Background: </bold>Dogs spontaneously develop invasive mammary carcinoma with a high prevalence of the triple-negative (TN) subtype (lack of ER-Estrogen Receptor and PR-Progesterone Receptor expression, lack of HER2-Human Epidermal Growth Factor Receptor 2 overexpression), making this animal model relevant for investigating new therapeutic pathways. Insulin-like growth factor Type-1 receptor (IGF1R) is frequently overexpressed in primary human breast cancers, with a growing role in the TN phenotype. The purpose of this study was to investigate the Dog as a candidate model for IGF1R-overexpressing mammary carcinoma.<bold>Methods: </bold>150 bitches with canine mammary carcinoma (CMC) and a known 2-year follow-up were retrospectively included. IGF1R expression was assessed by immunohistochemistry (IHC) using a similar scoring system as for HER2 in breast cancer. The prognostic value of the IGF1R expression was assessed in terms of overall and specific survival as well as disease-free interval (DFI).<bold>Results: </bold>47 CMC (31 %) were classified as luminal and 103 (69 %) as triple-negative (TN-CMC). 41 % of CMC overexpressed IGF1R (IHC score 3+) of which 76 % were TN-CMC and 62 % grade III. IGF1R overexpression was associated with aggressive features including lymphovascular invasion, histological grade III, low ER expression and the TN phenotype. Univariate and multivariate analyses revealed that IGF1R overexpression was associated with shorter overall and specific survivals and shorter DFI in TN-CMC.<bold>Conclusions: </bold>IGF1R overexpression is common and related to a poor outcome in canine invasive mammary carcinoma, particularly in the triple negative subtype, as in human breast cancer. Preclinical studies using the Dog as a spontaneous animal model could be considered to investigate new therapies targeting IGF1R in triple-negative breast cancer. [ABSTRACT FROM AUTHOR]
- Subjects :
- TRIPLE-negative breast cancer
INSULIN-like growth factor receptors
CANCER in dogs
MAMMARY gland cancer
CANCER invasiveness
EPIDERMAL growth factor receptors
ANIMAL experimentation
BIOLOGICAL models
BREAST tumors
DOGS
GENE expression
IMMUNOPHENOTYPING
LONGITUDINAL method
PROGNOSIS
TUMOR grading
Subjects
Details
- Language :
- English
- ISSN :
- 14712407
- Volume :
- 15
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- BMC Cancer
- Publication Type :
- Academic Journal
- Accession number :
- 110236397
- Full Text :
- https://doi.org/10.1186/s12885-015-1670-6