ERBB2 and breast carcinoma: The 10-year survival rate in the ROCK data set is 76% for luminal A and 54% for luminal B. All these values lie between those corresponding to our luminal subgroups, indicating the stratification based on the HER2-associated gene cluster and the top ten set of probes defined in this study provides a better segregation of luminal breast carcinomas for prognostic purposes.