Table 1. Clinicopathologic characteristics of patients according to age at diagnosis (n = 1,205).

Values are presented as number (%).

SLNB, sentinel lymph node biopsy; ALND, axillary lymph node dissection; LN, lymph node; HER2, human epidermal growth factor receptor 2; TNBC, triple-negative breast cancer.

^a)Nottingham histologic score system.