3.

Comparison of DFS and OS using the 8th edition of AJCC anatomic and prognostic staging system of luminal A breast cancer (N=421)

Stage	Anatomic stage groups						Prognostic stage groups
	n	5-year DFS (%)*	P**	5-year OS (%)*	P**		n	5-year DFS (%)*	P**	5-year OS (%)*	P**
DFS, disease-free survival; OS, overall survival; *, DFS and OS are analyzed by Kaplan- Meier survival analysis; **, log-rank test.
			0.003		0.203				0.012		0.006
I	216	99.4		98.9			342	96.9		98.7
II	155	91.9		96.8			61	94.6		95.9
III	42	97.0		94.6			10	87.5		78.8
IV	8			85.7			8			85.7