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Immunohistochemical Detection of Phospho-Akt, Phospho-BAD, HER2 and Oestrogen Receptors alpha and beta in Malaysian Breast Cancer Patients

Seow, Heng Fong and Yip, Wai Kien and Loh, Hui Woon and Ithnin, Hairuszah and Rohaizak, Mohammad and Por, Patricia (2009) Immunohistochemical Detection of Phospho-Akt, Phospho-BAD, HER2 and Oestrogen Receptors alpha and beta in Malaysian Breast Cancer Patients. Pathology and Oncology Research, 16 (2). pp. 239-248. ISSN 1532-2807

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Abstract

Activation of Akt signaling pathway has been documented in various human malignancies, including breast carcinoma. The objective of this study is to determine the incidence of Akt phosphorylation in breast tumours and its relationship with expression of ER-α, ER-β, HER2, Ki-67 and phosphorylated Bcl-2 associated death domain (p-BAD). Immunohistochemical staining was performed to detect these molecules on 43 paraffin-embedded breast tumour tissues with commercially available antibodies. Eighteen (41.9%), 3 (7.0%), 23 (53.5%), 35 (81.4%), 21 (48.8%), 29 (67.4%), and 34 (81.0%) of breast tumours were positive for nuclear ER-α, nuclear ER-β, membranous HER2, cytonuclear p-Akt (Thr308), p-Akt (Ser473), p-BAD and Ki-67, respectively. ER-α expression was inversely correlated with HER2 and Ki-67 (P=0.041 and P=0.040, respectively). The p-Akt (Ser473) was correlated with increased level of p-BAD (Ser136) (P=0.012). No relationship of Akt phosphorylation with HER2, ER-α or ER-β was found. The p-Akt (Ser473) immunoreactivity was significantly higher in stage IV than in stage I or II (P=0.036 or P=0.009). The higher Ki-67 and lower ER-α expression showed an association with patient age of <50 years (P=0.004) and with positive nodal status (P=0.033), respectively. Our data suggest that the Akt phosphorylation and inactivation of its downstream target, BAD may play a role in survival of breast cancer cell. This study does not support the simple model of linear HER2/ PI3K/Akt pathway in breast cancer.

Item Type: Article
Uncontrolled Keywords: ResPubID19206, breast cancer, Akt, oestrogen receptor, HER2
Subjects: Faculty/School/Research Centre/Department > School of Biomedical and Health Sciences
FOR Classification > 1112 Oncology and Carcinogenesis
Depositing User: VUIR
Date Deposited: 21 Nov 2011 05:36
Last Modified: 21 Mar 2013 03:39
URI: http://vuir.vu.edu.au/id/eprint/4578
DOI: 10.1007/s12253-009-9216-3
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Citations in Scopus: 4 - View on Scopus

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