Algorithms|Breast Neoplasms|Databases, Nucleic Acid|Discriminant Analysis|Gene Expression Profiling|Gene Expression Regulation, Neoplastic|Humans|Least-Squares Analysis|Leukemia|Lymphoma|Models, Genetic|Models, Statistical|Neoplasms|Oligonucleotide Array Sequence Analysis|Principal Component Analysis|Reproducibility of Results|Sensitivity and Specificity|Sequence Analysis, DNA|Tumor Cells, Cultured