Analysis of risk factors associated with survival in human epidermal growth factor receptor 2-positive ductal carcinoma using Korean Breast Cancer Society Database.

Purpose: This study was performed to identify the risk of mortality in patients diagnosed with human epidermal growth factor receptor 2 (HER2)-positive ductal carcinoma (DCIS).

Methods: We selected 2,592 patients with HER2-positive DCIS from Korean Breast Cancer Society (KBCS) database between January 1997 and December 2019. Patients who received neoadjuvant chemotherapy were excluded.