ERBB2 and cancer: Regarding intratumoural LAMP3+ cells, the highest positive cell count was observed in the triple-negative subtype, which was significantly higher than in the luminal/HER2+ (p < 0.001) and luminal/HER2− (p < 0.001) subtype, followed by HER2+ non-luminal cancers, which contained significantly more LAMP3+ cells within the tumour than luminal/HER2− (p = 0.04) and luminal B/HER2+ (p < 0.015) subtypes.