Biomarkers, Tumor/genetics; Breast Neoplasms/genetics; Carcinoma, Ductal, Breast/genetics; Carcinoma, Lobular/genetics; Gene Expression Profiling/methods; In Situ Hybridization; MicroRNAs/analysis; Oligonucleotide Array Sequence Analysis; Biomarkers, Tumor/analysis; Biopsy; Breast Neoplasms/chemistry; Breast Neoplasms/mortality; Breast Neoplasms/pathology; Carcinoma, Ductal, Breast/chemistry; Carcinoma, Ductal, Breast/mortality; Carcinoma, Ductal, Breast/secondary; Carcinoma, Lobular/chemistry; Carcinoma, Lobular/mortality; Carcinoma, Lobular/secondary; Chi-Square Distribution; Female; Fixatives; Formaldehyde; Humans; Immunohistochemistry; Kaplan-Meier Estimate; Neoplasm Grading; Neoplasm Invasiveness; Neoplasm Staging; Paraffin Embedding; Prognosis; Proportional Hazards Models; Reverse Transcriptase Polymerase Chain Reaction; Time Factors; Tissue Fixation/methods