Human epidermal growth factor receptor type 2 (her2/neu) immunohistochemical detection in breast carcinoma
DOI:
https://doi.org/10.51481/amc.v57i1.866Keywords:
breast cancer, human epidermal growth factor receptor type 2 (HER-2), immunohisto chemistryAbstract
Background: The incidence and mortality due to breast cancer has suffered a net increase. One type of this heterogeneous disease is characterized by an amplification and higher expression of the ERBB2 gene that codifies for human epidermal growth factor receptor type 2 (HER-2). This receptor mediates oncogenic processes and such tumors have been associated with a worse prognosis. The aim of this study was to analyze the characteristics of HER-2+ tumors in a group of patients with breast cancer.
Methods: This study included cases of breast cancer diagnosed through biopsy, registered during 2006 in the archives of the Pathology Department of the San Juan de Dios Hospital. The HER-2 expression was studied and statistical analyses were performed in cases that had immunohistochemical studies.
Results: Thirty-four HER-2+ tumors were found (15.7 %), 24 with a strong expression (11.1%) and 10 with a weak expression (4.6%). The average age at diagnosis of patients with a strong expression was 46.9 years (42.5-51.1 IC 95%) and in those with a weak expression, 54.4 years (46.7-62.1 IC 95%). In the case ofHER-2- tumors, de mean age at diagnosis was 58.1 years (56.2-60.0 IC 95%). Patients <50 years had an OR=3.477 of having HER-2+. Out of 21 tumors, 90.5% showed a high histologic grade and out of 16 cases, only 3 measured <2 cm.
Conclusion: The data found is similar to the latest global statistics. An association was found between HER-2+ type tumor and young patients, larger size tumors and higher histologic grade.
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