Aim of the study: Immunohistochemical evaluation of hormone receptors, Her2/neu, CK5/6, E-cadherin, beta-catenin, p53 and PTEN on Tissue Micro Array (TMA) of 46 Moroccan invasive breast carcinomas. Materials and Methods: The cases comprised 40 invasive ductal carcinomas, 4 invasive lobular carcinomas, 1 mixed carcinoma and 1 invasive colloid carcinoma. TMA paraffin blocs were prepared with the Beecher manual arrayer and immunostaining was performed using standard immunoperoxidase techniques.

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... ults: 58.69% of the cases were ER positive. 43.18% (19/44) were triple negative breast cancers (TNBC) of which 15.78% (3/19) were of the basal phenotype expressing CK5/6. On the other hand, 72.22% (13/18) of the TNBC cases were IDC grade 3. Of the 18 IDC grade 3, 22.22% (4/18) were CK5/6 positive. 41.30% and 10.86% of the cases showed reduced expression of E-cadherin and beta-catenin respectively. Beta-catenin nuclear and cytoplasmic staining was noted in 20% and 97.82% respectively. p53 was overexpressed in 10.86% of the cases whereas PTEN loss or reduced expression was noted in 86.95% of the cases. Conclusion: The aim of our study was to introduce TMA technique in our hospital which is considered a reference institution for cancer in Morocco. Although no statistical study was performed to look for any significance of the results obtained, we found good correlation with some of the data in the literature. To determine the molecular characteristics, if any, of the Moroccan patient, larger multidisciplinary and prospective studies would be interesting in the aim to personalize therapeutic decisions.