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2015 ; 15
(ä): 664
Nephropedia Template TP
gab.com Text
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English Wikipedia
The dog as a naturally-occurring model for insulin-like growth factor type 1
receptor-overexpressing breast cancer: an observational cohort study
#MMPMID26449867
Jaillardon L
; Abadie J
; Godard T
; Campone M
; Loussouarn D
; Siliart B
; Nguyen F
BMC Cancer
2015[Oct]; 15
(ä): 664
PMID26449867
show ga
BACKGROUND: 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. METHODS: 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). RESULTS: 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. CONCLUSIONS: 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.