AZD8931, an equipotent, reversible inhibitor of signaling by epidermal growth factor receptor (EGFR), HER2, and HER3: preclinical activity in HER2 non-amplified inflammatory breast cancer models

Journal of Experimental & Clinical Cancer Research

Massimo Cristofanilli¹  Sandra V Fernandez¹  Chris Womack³  Emily Foster³  Xiaoshen Dong²  Teresa Klinowska³  Zhaomei Mu¹ 

[1] Department of Medical Oncology, Fox Chase Cancer Center, Philadelphia, PA 19111, USA;Department of Surgical Oncology, First Affiliated Hospital, China Medical University, Shenyang, People’s Republic of China;AstraZeneca, Macclesfield, Cheshire, UK

关键词: Paclitaxel;    AZD8931;    HER3;    HER2;    EGFR;    Inflammatory breast cancer;   

Others  :  801118
DOI  :  10.1186/1756-9966-33-47

 received in 2014-02-04, accepted in 2014-05-13,  发布年份 2014

【 摘 要 】

Introduction

Epidermal growth factor receptor (EGFR) overexpression has been associated with prognostic and predictive value in inflammatory breast cancer (IBC). Epidermal growth factor receptor 2 (HER2) overexpression is observed at a higher rate in IBC compared with noninflammatory breast cancer. Current clinically available anti-HER2 therapies are effective only in patients with HER2 amplified breast cancer, including IBC. AZD8931 is a novel small-molecule equipotent inhibitor of EGFR, HER2, and HER3 signaling. In this study, we investigated the antitumor activity of AZD8931 alone or in combination with paclitaxel using preclinical models of EGFR-overexpressed and HER2 non-amplified IBC cells.

Methods

Two IBC cell lines SUM149 and FC-IBC-02 derived from pleural effusion of an IBC patient were used in this study. Cell growth and apoptotic cell death were examined in vitro. For the in vivo tumor growth studies, IBC cells were orthotopically transplanted into the mammary fat pads of immunodeficient mice. AZD8931 was given by daily oral gavage at doses of 25 mg/kg, 5 days/week for 4 weeks. Paclitaxel was subcutaneously injected twice weekly.

Results

AZD8931 significantly suppressed cell growth of IBC cells and induced apoptosis of human IBC cells in vitro. Significantly, we showed that AZD8931 monotherapy inhibited xenograft growth and the combination of paclitaxel + AZD8931 was demonstrably more effective than paclitaxel or AZD8931 alone treatment at delaying tumor growth in vivo in orthotopic IBC models.

Conclusion

AZD8931 single agent and in combination with paclitaxel demonstrated signal inhibition and antitumor activity in EGFR-overexpressed and HER2 non-amplified IBC models. These results suggest that AZD8931 may provide a novel therapeutic strategy for the treatment of IBC patients with HER2 non-amplified tumors.

【 授权许可】

   
2014 Mu et al.; licensee BioMed Central Ltd.

【 图 表 】

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