SYK and ductal breast carcinoma in situ: All of the benign epithelium (5 cases of benign with no DCIS or IDC detected) and 8 DCIS tissues from DCIS only cases displayed normal Syk/centromere probe ratios indicating no allelic loss, with a range of 0.7 to 1.1 Syk/centromere probe ratios (Figs. 1B–C).