In patients with luminal-type breast cancer (positive for ER and/or PgR), a complete consensus on the threshold indication for a combination of chemotherapy and endocrine therapy has not been achieved, especially for patients with HER2-negative luminal type (HNLT). Girdin, an actin-binding Akt substrate, plays a crucial role in the migration of cancer cells. This study examined the expression of Girdin in relation to clinicopathological features and other immunohistochemical markers (HER2, Ki-67), especially in patients with HNLT breast cancer.