To further explore subtype-specific expression patterns, we assessed the expression of CCL18 and EGF across defined molecular subtypes of BRCA, including luminal A, luminal B, HER2-enriched, and triple-negative breast cancer (TNBC) (Figures 2a, 2b, 2c, and 2d). The gene discussed is ERBB2; the disease is triple-negative breast carcinoma.