A complete loss of HLA class I expression did not show correlations with clinicopathologic features of tumors except for absence of microinvasion (p = 0.005) in DCIS (Supplementary Table S2) and low Ki-67 proliferation index (p = 0.033) as well as absence of p53 overexpression (p = 0.020) in IBCs (Supplementary Table S3). Here, MKI67 is linked to ductal breast carcinoma in situ.