Resumen

FERNANDEZ, Ángel et al. Evaluation of HER2 oncogene amplification in breast cancer patients through technical chromogenic in situ hybridization. Salus [online]. 2014, vol.18, n.1, pp.7-12. ISSN 1316-7138.

HER2 proto-oncogene is located on chromosome 17. It encodes a transmembrane glycoprotein called human epidermal growth factor receptor 2 (HER2). It is amplified at low levels in many normal tissues and regulates growth, differentiation and cell death. HER2 overexpression is the result of abnormalities in the HER2 oncogene amplification. The aim of this study was to evaluate the HER2 oncogene amplification in patients with breast cancer through the chromogenic in situ hybridization (CISH) technique. The sample consisted of 200 biopsies fixed in 10% formalin, processed by standard techniques to paraffin embedding, from patients diagnosed with infiltrating ductal carcinoma of the breast, coming from private practice and the Institute of Oncology "Dr. Miguel Pérez Carreño", with immunohistochemical study performed at Northern Metropolitan Hospital in Valencia. It was found a statistically significant association (p<0.001) of HER2 amplification with different quantitative levels of the product of the gene expression. It is noteworthy that there were 16 (11%) of 146 cases considered negative from the immunohistochemical point of view for the HER2 expression, that proved to be amplified for the oncogene through the CISH. Likewise, it is emphasized that more than half (52.4%) of the positive cases (3+) showed no amplification. This study shows the importance of the determination of HER2 amplification in cases result of 1+ by immunohistochemistry, demonstrating a 12.3% positive for these cases to the oncogene amplification.

Palabras clave : Breast cancer; HER2; chromogenic in situ CISH.

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