Differences in expression profiles were also found to exist between individual breast tumors and, in some cases, were significantly associated with conventional pathological parameters and prognostic indices: tumor grade (K (lysine) acetyltransferase 5 (KAT5), HDAC1, KDM4A, SUV39H1 and KDM6A)); TNM stage (SUV39H1, K (lysine) acetyltransferase 2B (KAT2B), lysine (K)-specific demethylase 1A (KDM1A), KDM4A, lysine (K)-specific demethylase 5C (KDM5C), K (lysine) acetyltransferase 8 (KAT8), HDAC5 and KAT5)); Nottingham Prognostic Index (KDM5C, myeloid/lymphoid or mixed-lineage leukemia (MLL), KAT8 and SET and MYND domain containing 3 (SMYD3)); receptor status (KAT5, SMYD3 and KDM1A); histological type (KAT5, KDM5C, KAT8, KDM4A and MLL); disease-free survival (SUV39H1, SMYD3, HDAC5, KDM6A, HDAC1, KDM1A, KDM4A, KAT8, KDM5C, KAT5 and MLL) and overall survival (KAT8).