CPB1 and ductal breast carcinoma in situ: Next, we performed qPCR for CPB1 in breast tissue samples different from those used in HTA or IHC analysis: DCIS (n = 5) from women diagnosed with no other breast disease (DCIS), DCIS (n = 5) from women diagnosed with an IDC (DCIS adjacent to IDC), and IDC (n = 10) from 5 women also diagnosed with DCIS and 5 women with no other breast disease (IDC) (Figure 2C).