RESUMO
OBJECTIVE: The aim: The study aimed assessment of immunohistochemical expression of ER, PR, Ki-67 and HER2 in breast carcinoma, studied the relation between size of primary tumor and these markers and distribution of molecular subtypes between both study groups. PATIENTS AND METHODS: Materials and methods: The study was implemented immunohistochemistry laboratories of Al-Sadder Teaching Medical City in Al Najaf during the period from September 2020-september2021, forty four women with breast carcinoma who undergone modified radical mastectomy were involved in this study, aged between 29 -81 years, mean age being 47.3 yr. we divided study group into two categories; depending on tumor size, with cutoff point of 2 cm. Envision technique applied for evaluation of expression of ER, PR, Ki-67 and HER2. RESULTS: Results: Among all patients, ER expressed in 70.45%, PR in 68.18%, HER2/neu in 18.18%, High ki-67 index in 52.27%. CONCLUSION: Conclusions: Molecular subtype luminal A tend to occur in smaller tumor size compared to basal subtype which tend to occur in larger size of tumors. Breast carcinoma tumor size showed no significant correlation regarding histological grade, immunohistochemical expression of ER, PR, HER2, and Ki-67 labeling index.