CD8A and ductal breast carcinoma in situ: DCIS intraepithelial CD68+ cell density (median 20.3 cells/mm2, IQR 8.0–50.6) and CD8+Ki67+ T-cell density (median 0.85 cell/mm2, IQR 0.21–2.87) did not differ from stromal CD68+ cell and CD8+Ki67+ T-cell density (P = 0.48 and P = 0.71, respectively).