 Breast carcinoma is a group of diseases with specific clinical, histopathologic, and molecular properties that have been traditionally classified based on morphology. However, traditional classification systems have limitations, and new molecular methods are expected to improve classification systems. Molecular subtypes of breast carcinomas have been characterized in the last 11 years, but much information is still being developed and undergoing change. The main question is whether new molecular techniques such as gene expression profiling will be accepted as a gold standard in determining breast cancer subtypes, and whether molecular classification is useful in specific subtypes of breast cancer. However, current molecular approaches are not yet used in routine clinical practice due to poor definition, lack of reproducibility, and lack of quality control. This article was authored by Nukit Eliatkin, Evrim Yeltsin, Baha Zengel, and others. We are article.tv, links in the description below.