The present invention relates to sets of genetic markers whose expression is correlated with prognosis of breast cancer in individuals having breast cancer. Specifically, the invention provides sets of markers whose expression patterns can be used to differentiate individuals having a good prognosis, e.g., no reoccurrence or metastasis within five years of initial diagnosis, and individuals having a poor prognosis, e.g., reoccurrence or metastasis within five years of initial diagnosis. The invention relates to methods of prognosis using these markers. The invention also relates to microarrays containing probes to these markers, and to kits containing ready-to-use microarrays and computer software for data analysis using the prognostic and statistical methods disclosed herein.