Anatomic visualization and molecular typing of metastatic regional lymph nodesin breast cancer patients are a serious clinical challenge in modern oncology.According to the results of previous studies, [99mTc]Tc-(HE)3-G3 has proven tobe a promising diagnostic agent in differentiating the HER2/neu receptor statusin primary breast tumors (p < 0.05, Mann–Whitneytest). The gene discussed is ERBB2; the disease is breast neoplasm.