Table 1.

Clinicopathologic characteristics of patients according to age

Age	<40y		40 ~ 50y		P value
character	No.	%	No.	%
T stage					<0.01
T1	520	38.2	1072	34.5
T2	625	46.0	1914	56.3
T3	215	15.8	124	9.2
N stage					0.07
N0	626	46.0	1580	50.8
N1	324	23.8	787	25.3
N2	324	23.8	606	19.5
N3	86	6.4	137	4.4
Family history					<0.01
Yes	80	5.9	44	1.4
No	1280	94.1	3066	98.6
Tumor Grade					<0.01
Grade I	56	4.1	93	3.0
Grade II	775	57	2233	71.8
Grade III	529	38.9	784	25.2
Tumor type					0.4
IDC	1216	89.4	2762	88.8
ILC	60	4.4	168	5.4
Others	84	6.2	180	5.8
LVI					<0.01
Positive	413	30.4	790	25.4
Negative	947	69.6	2320	74.6
ER status					<0.01
Positive	821	60.4	2133	68.6
Negative	539	39.6	977	31.4
PR status					0.9
Positive	826	60.7	1894	60.9
Negative	534	39.3	1216	39.1
HER2 status					0.01
Positive	390	28.7	647	20.8
Negative	970	71.3	2463	79.2
Subtype					<0.01
Luminal A	660	48.5	1959	59.2
Luminal B	344	25.3	579	17.5
Her2 positive	129	9.5	327	9.9
Triple negative	227	16.7	445	13.4
Srugery					<0.01
BCS	223	16.4	236	7.6
Mastectomy	1137	83.6	2874	92.4
Endocrine therapy					0.7
No	204	15.0	442	14.2
Yes	1156	85	2668	85.8
Chemotherapy					0.4
No	92	6.8	308	9.9
Yes	1268	93.2	2802	90.1
Radiotherapy					0.1
No	1020	75.0	2568	82.6
Yes	340	25.0	542	17.4

Abbreviation:

IDC intraductal carcinoma.

ILC intralobular carcinoma.

LVI  lymphovascular invasion.

ER eostregen receptor.

PR progesterone receptor.

BCS breast conservative surgery.