The Japanese Breast Cancer Society (JBCS) has been accumulating breast cancer patient data since 1975, which reached a total of 188,265 cases over 29 years. However, the recent increase in breast cancer incidence in Japan has made it impossible to maintain the same data pooling system for further analysis of disease trends. Therefore, the JBCS launched a new patient registration system from 2004, and it now contains data on 252,922 cases for the period 2004-2011. Furthermore, since 2012, the JBCS Breast Cancer Registry has been combined with the National Clinical Database (NCD). This article summarizes the current status of the NCD Breast Cancer Registry in conjunction with future perspectives, including quality indicator analysis, guideline evaluation using prognostic outcomes, and development of a real-time personalized survival analysis tool using the NCD Breast Cancer Database.