T he most common cancer in women is breast cancer. The gold standard tests for the diagnosis of breast cancer are immunohistochemical and histopathological evaluations. Further research is needed regarding estrogen receptors, progesterone receptors, tumor size, and the occurrence of metastases because currently there are not many studies in Indonesia that link breast cancer with the results of its examination..METHODObservational analytic research with cross sectional design. Using a non-probability sampling method, this study involved 120 medical records of breast cancer patients at Tarakan Hospital, Jakarta. Breast cancer patients at RSU Tarakan Jakarta who were enrolled between 2021 and 2023 and had results of examinations regarding tumor size, ER profile, PR, histological type of cancer, and metastatic status were included in the study. The chi-square test was used in data analysis.RESULTSThe majority of patients (55%) were over 49 years old, included in the pre-elderly category. Invasive ductal carcinoma or non-specific invasive carcinoma accounts for 87.5% of all cancer cases. The most common positive results were found for the estrogen receptor (62.5%) and the progesterone receptor (76.7%). According to the results of the physical examination, the tumor was T2 (61.7%) and measured between 2 and 5 cm. The results of the analysis revealed that many (55%) had experienced metastatic events.CONCLUSIONThere are many breast cancer patients who are detected older than 49 years. IDC is the most common type of breast cancer. The occurrence of metastases is related to ER and PR, but not to tumor size.