Summary of IRF expression in breast tissue specimens. A. Percent of samples with positive staining is shown on y-axis, tissue and disease type are shown on x-axis. Number of samples positive for IRF1 or IRF5 is shown over total number of patient samples examined in each group. Statistical significance was determined by comparing the number of positive-stained samples in each disease type to positive-stained samples in normal tissues; * denotes P < 0.05, **P < 0.001. B. Same as in A, except expression in different stages of DCIS is shown.