Table 2. Stage distribution of newly diagnosed breast cancer patients in 2015 (KBCS registry data).

Stage	No. of patients (%)
0	1,311 (14.8)
I	3,821 (43.3)
II	2,593 (29.3)
III	706 (8.0)
IV	95 (1.1)
Unknown	307 (3.5)
Total	8,833 (100)

KBCS=Korean Breast Cancer Society.