| Summary: | Background: Breast cancer is still a global public health problem, especially in women and is the second leading cause of death after lung cancer. Indonesia is a country with a high incidence of breast among women.
Methods: This study used a retrospective study of breast cancer patients registered at Division of Surgical Oncology in Indonesia. Information about demographic, clinical and pathological characteristics of patients for a period of 5 years (2014 to 2020) were collected and described.
Results: Information for 1260 cases of breast cancer who underwent IHC examination with an average age of 53.73 years of patients, with the most age above 50 years (63.6%) were collected. On IHC examination, 58.6% positive estrogen receptors were found, positive progesterone receptors were 55.4%, Her2 was positive 37.7% and high Ki67 protein was 56.9%. The most common breast cancer subtypes were luminal B (43.2%), followed by luminal A (21.7%), TNBC (18.1%), and Her2 (17%), with the highest stages being IIIB (31.7%).
Conclusions: The breast cancer was presented at higher stage, with more cases with estrogen or progesterone receptors are positive with low frequency of Her2 positivity and high in Ki67 protein expression.
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