CD276 and breast cancer: For the three-tier classification, B7-H3 positivity was significantly associated with high lymphocytic infiltration in unselected breast cancers (Figure 2h, p = 0.0002, Chi-square) and TNBC (Figure 2k, p = 0.0148, Chi-square), but not within ER+ (Figure 2i) and HER2+ cases (Figure 2j).