Doctors and scientists now regard cancer as a 'disease of the genes' and in this field there are new diagnostic tools, previously unavailable, able to provide individual information that can help to predict future behavior of the tumor. This is done by identifying the molecular signature of a breast tumor. A Genomic profiling test determines the risk of tumor spreading. Analyzing the gene expression profile provides a snapshot inside the tumor. This important information can then be used to determine the risk of recurrence of the disease.