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Background: Breast cancer is the leading cancer among women. The management depends largely on the knowledge of prognostic factors. The aim of our study is to evaluate the overexpression of Her-2/neu in patients with invasive breast carcinoma in Morocco, and to study the association between this overexpression and otherprognostic factors of breast cancer, such as age, tumor size, tumor grade, hormone receptors, vascular space invasion and lymph node status. Methods: This is a transversal study in which we included patients with invasive breast carcinomas treated at University Hospital Ibn Rochd of Casablanca in radiotherapy-oncology departement between January 2008 and December 2010, having had surgery first. Univariate analysis (Chi 2 test and Student’s test) and multivariate (logistic regression) were performed to study this association. Results: The overexpression of Her-2/neu was found in 29.2% of cases. In univariate analysis, Her-2 positive status was significantly correlated with high-grade tumors and large, to a lymph node, vascular space invasion and negative ER/PR. Age alone does not appear as a factor associated with positive Her-2/neu status. In multivariate analysis, the overexpression of Her 2 was significantly associated only with vascular space invasion, high tumor grade and the negativity of estrogen receptors. Conclusion: In our series, only the high grade, the vascular space invasion and the negative hormone receptors are independent factors associated with overexpression of Her 2/neu. Age does not appear as a factor associated with positive Her-2/neu status

Association between Overexpression of Her-2 and Other Clinicopathologic Prognostic Factors in Breast Cancer in Morocco