EGFR and breast carcinoma: The binding of ligands such as epidermal growth factor (EGF), transforming growth factor‐alpha (TGF‐α), epigen, betacellulin, and amphiregulin bind to EGFR, initiate receptor dimerization and tyrosine auto‐phosphorylation, triggering multiple cellular signaling cascades which aid in the proliferation, growth, adhesion, differentiation, migration, and survival of breast cancer cells.7