In this analysis, we identified subtype‐specific events for Epi‐LumB tumors involving either DNA copy number loss or CpG promoter methylation over DZIP1, TNFSF11, ZIC5, COL4A2, COL4A1 and PCDH8 indicating candidate tumor suppressor genes (Figure 5A; Supplementary Figure 3). The gene discussed is COL4A2; the disease is neoplasm.