Burhanuddin, LaodeFidiawati, Wiwit AdeHakim, Lukman2015-04-222015-04-222015-04-22wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/7031Malignancy is a diseases that can cause death. Recording and reporting of cancer is one way to determine the prevalence of cancer. This study is to determine the prevalence of primary organ malignancy by histophatology in Arifin Achmad General Hospital Center Pekanbaru period January-December 2013. The result of this study indicate that most primary malignancy in organ found in breast on woman and nasopharyngeal in second range of man. With total cases of malignancy 139 for breast cancer and 37 for nasopharyngeal cancer.encarcinoma nasopharyngealcarcinoma breasthistopathologyUR e-Research