Biomarkers, Tumor|Breast Neoplasms|Female|Gene Expression Profiling|Gene Expression Regulation, Neoplastic|Genomics|Humans|Middle Aged|Models, Statistical|Neoplasm Grading|Neoplasm Staging|Oligonucleotide Array Sequence Analysis|Prognosis|Receptor, ErbB-2|Receptors, Estrogen|Reproducibility of Results|Survival Rate