The patient was a 67-year-old woman with a Luminal B (HER2-negative)-type invasive ductal carcinoma (solid ductal cancer, ER 100%, PR 90%, HER2 1 + , Ki-67 20%, grade 1, T2N1M0, stage IIB) and ipsilateral axillary LN metastasis diagnosed by aspiration cytology. The gene discussed is MKI67; the disease is invasive ductal breast carcinoma.