Table 2. Stage distribution of newly diagnosed breast cancer patients in 2017 in Korea (KBCS registry data).

Stage*	No. of patients
0	2,052 (17.7)
I	4,995 (43.0)
II	3,424 (29.5)
III	898 (7.8)
IV	100 (0.8)
Unknown	143 (0.8)
Total	11,612 (100.0)

Values are presented as number (%).

KBCS = Korean Breast Cancer Society.

^*Stage was based on the American Joint Committee on Cancer Cancer Staging Manual, seventh edition.