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BMC Cancer
Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Prognostic value of HER2 status in bladder transitional cell carcinoma revealed by both IHC and BDISH techniques

Authors: Taoufik Nedjadi, Jaudah Al-Maghrabi, Mourad Assidi, Ashraf Dallol, Heba Al-Kattabi, Adeel Chaudhary, Ahmed Al-Sayyad, Adel Al-Ammari, Adel Abuzenadah, Abdelbaset Buhmeida, Mohammed Al-Qahtani

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

Her2/neu is an oncogene that plays an important role in the pathogenesis of many cancer types. In bladder carcinoma (BC), the clinical significance of Her2/neu status remains under-investigated and poorly linked to the patients’ clinic-pathological features and survival status. Thus, the current study was conducted to assess Her2/neu status in a cohort of patients’ in Saudi Arabia, and to explore its prognostic value in BC.

Methods

A total of 160 consent patients of transitional cell carcinoma (TCC) of bladder were arranged on a tissue microarray (TMA) and stained by immunohistochemistry (IHC) and bright-field dual in situ hybridization (BDISH) methods. The intensity of Her2/neu protein receptor immunostaining was evaluated, correlated to Her2/neu gene amplification status in TCC and assessed for potential clinical value by correlation measures.

Results

IHC data demonstrated that Her2/neu protein is expressed in 60 % (2+ and 3+) of our TCC patient’s cohort from Saudi Arabia. Her2/neu gene amplification is detected in 25 % by BDISH. There was a strong association between Her2/neu protein levels and lymph node invasion (p = 0.04), tumor stage (p = 0.002), vascular invasion and borderline significance with distant metastasis (p = 0.07). Amplification of Her2/neu gene was associated with tumor grade (p = 0.03) and poor disease-specific survival (p = 0.02), in that, patients with non-amplified Her2/neu gene live longer. Interestingly, there was a reasonable concordance rate (71 %) between IHC and BDISH data in the analyzed cohort.

Conclusion

The study showed that 25 % of our patients’ cohort has Her2/neu over-expression. This Her2/neu (over-expression/amplification) status was concordant using either IHC or BDISH and significantly associated with disease aggressiveness and poor outcome. These findings suggested a potential impact of anti-Her2 targeted therapy in the treatment of bladder cancer with amplified/overexpressed HER2 that needs further investigation.
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Metadata
Title
Prognostic value of HER2 status in bladder transitional cell carcinoma revealed by both IHC and BDISH techniques
Authors
Taoufik Nedjadi
Jaudah Al-Maghrabi
Mourad Assidi
Ashraf Dallol
Heba Al-Kattabi
Adeel Chaudhary
Ahmed Al-Sayyad
Adel Al-Ammari
Adel Abuzenadah
Abdelbaset Buhmeida
Mohammed Al-Qahtani
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2703-5

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