Palavra-chaves: câncer de mama, imunohistoquímica, tratamento oncológico. ABSTRACT reast cancer is a public health problem, not only in underdeveloped countries, as is the case in Brazil, but also in developed countries, such as the United States and in some Western European countries. The frequency of distribution of the different types of cancer varies according to the characteristics of each region, which emphasizes the need to study geographic variations, risk factors and patterns of this disease that pervade regional particularities. Objective: The present study describes the immunohistochemical profile and treatments of patients treated at the oncology reference hospital in the northern region of the country. Method: The study is cross-sectional and descriptive, conducted through interviews and analysis of clinical records of 114 patients treated at Hospital Ophir Loyola, between the years 2016 and 2017, in the city of Belém, in the state of Pará. Data were presented in the form of absolute and relative frequency. Results: The most frequent histopathological classification was invasive ductal carcinoma and the most frequent immunohistochemical profile was luminal B, followed by luminal A. Conclusion: The most common histological type was infiltrative ductal carcinoma and the most prevalent immunohistochemistry was luminal B which are directly associated with poor prognosis, which highlights the importance of clarification actions on early detection, knowledge of the disease and encouraging the practice of physical exercise and healthy eating, in order to reduce morbidity and mortality, improving the prognosis of affected women for this pathology.

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