DCIS intraepithelial lymphocyte, CD3+ T-cell, CD20+ B-cell, CD3+CD8− T-cell, CD3+FOXP3+ T-cell, CD3+CD8+ T-cell, CD8+Ki67+ T-cell, and CD68+ cell density did not differ between cases and controls (Supplementary Fig. 1). Here, MKI67 is linked to ductal breast carcinoma in situ.