We were also able to partially confirm the report that Chromosome 3p losses were more frequent in DCIS than in IBC [38], although that appeared to be primarily driven by the more common Luminal A tumors, while in our cohort, Basal and HER2 DCIS showed lower 3p losses than the corresponding TCGA IBC. The gene discussed is ERBB2; the disease is ductal breast carcinoma in situ.