One of the fundamental aspects of smart cities is an improvement in the health sector, by providing its citizens with better care and prevention and detection of diseases. Breast cancer is one of the most common diseases and the one with the highest incidence in women worldwide. In smart cities, to improve the quality of life of its citizens, especially for women, is to diagnose breast tumors in shorter periods with simpler and automated methods. In this chapter, a new deep learning architecture is proposed to segment breast cancer tumors.