Based on the presence or absence of hormone receptors (HR) and human epidermal growth factor receptor 2 (HER2) breast cancer was further categorized among four different molecular subtypes such as Luminal A (HR+/HER2‐), Triple‐negative breast cancer (HR‐/HER2‐), HER2‐enriched (HR‐/HER2+), and Luminal B (HR+/HER2+).4 This evidence concerns the gene ERBB2 and breast cancer.