The clusters that comprised stroma cells with connections to inflammatory cells (STR0, STR1 and STR8) were enriched in HR-HER2+ and TNBCs, while STR2, STR3, STR4, STR6 and STR7 cells were enriched in HR+HER2- breast cancers (Supplementary Fig. S7a, b). This evidence concerns the gene MMP3 and breast cancer.