RAD51 and breast neoplasm: We therefore analyzed data obtained by Muggerud et al.[28] who studied global gene expression of 109 breast tumors and 6 normal breast tissues using Agilent Whole Human Genome Oligo Microarrays 44k, which contain probes for RAD51, E2F1, TODRA and TPIP. Correlation of these genes' expression (Table 1) shows a negative correlation between RAD51 and TODRA (p = 0.01), reflecting their opposite regulation by E2F1, which is positively correlated with RAD51 (p< 0.001) and negatively with TODRA (p = 0.002).