and 29 as basal (CK5/6+ and GATA3-). Additional sequential TMA sections were stained for CD3, CD4, CD8, CD20, CD68, CD163, FOXP3, programmed cell death protein 1 (PD-1), and programmed death-ligand 1 (PD-L1) (SP263). Basal-subtype tumours showed a trend towards worse