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Erschienen in: Breast Cancer Research and Treatment 3/2012

01.12.2012 | Preclinical study

Evaluation of IGF1R and phosphorylated IGF1R as targets in HER2-positive breast cancer cell lines and tumours

verfasst von: Brigid C. Browne, Alex J. Eustace, Susan Kennedy, Neil A. O’Brien, Kasper Pedersen, Martina S. J. McDermott, Annemarie Larkin, Jo Ballot, Thamir Mahgoub, Francesco Sclafani, Stephen Madden, John Kennedy, Michael J. Duffy, John Crown, Norma O’Donovan

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2012

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Abstract

Insulin-like growth factor-1 receptor (IGF1R) signalling is implicated in resistance to trastuzumab. However, the benefit of co-targeting HER2 and IGF1R has not been extensively studied, and the relationship between activated IGF1R and clinical response to trastuzumab has not been reported. This study aimed to evaluate the combination of trastuzumab with IGF1R tyrosine kinase inhibitors (TKIs) in a panel of HER2-positive breast cancer cell lines, and to examine the relationship between IGF1R expression and activation and response to trastuzumab in HER2-positive breast cancer patients. The anti-proliferative effects of trastuzumab combined with IGF1R TKIs BMS-536924 or NVP-AEW541 were measured in nine HER2-positive cell lines. IGF1R and phosphorylated IGF1R/insulin receptor (pIGF1R/IR) were measured by immunohistochemistry in 160 tumour samples from trastuzumab-treated patients (ICORG 06-22). The HER2-positive cell lines displayed varying sensitivity to IGF1R TKIs alone (IC50s: 0.7 to >10 μM). However, when combined with trastuzumab, a significantly enhanced effect was observed in five cell lines treated with BMS-536924, and three with NVP-AEW541. While IGF1R levels correlated with reduced response to NVP-AEW541 alone, neither IGF1R nor pIGF1R were predictive of response to BMS-536924 or NVP-AEW541 in combination with trastuzumab. Low HER2 levels correlated with response to BMS-536924 in combination with trastuzumab. Akt levels correlated with improved response to trastuzumab and NVP-AEW541 (P = 0.039). Cytoplasmic IGF1R staining was observed in all tumours, membrane IGF1R was detected in 13.8 %, and pIGF1R/IR was detected in 48.8 %. Although membrane IGF1R staining was associated with larger tumour size (P = 0.041), and lower tumour grade (P = 0.024), no association between IGF1R or pIGF1R/IR and patient survival was observed. In conclusion, while neither IGF1R expression nor activation was predictive of response to trastuzumab, these pre-clinical data provide evidence that co-targeting HER2 and IGF1R may be beneficial in some HER2-amplified breast cancers.
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Metadaten
Titel
Evaluation of IGF1R and phosphorylated IGF1R as targets in HER2-positive breast cancer cell lines and tumours
verfasst von
Brigid C. Browne
Alex J. Eustace
Susan Kennedy
Neil A. O’Brien
Kasper Pedersen
Martina S. J. McDermott
Annemarie Larkin
Jo Ballot
Thamir Mahgoub
Francesco Sclafani
Stephen Madden
John Kennedy
Michael J. Duffy
John Crown
Norma O’Donovan
Publikationsdatum
01.12.2012
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 3/2012
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-012-2260-9

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