Clinicopathological features of infiltrating lobular carcinomas comparing with infiltrating ductal carcinomas: a case control study

Table 1 Biological characteristics of the patients and tumors by histologic group

	Histopathology
	Infiltrating ductal carcinoma		Infiltrating lobular carcinoma		Total
Factor	Number of patients (n = 3621)	%	Number of patients (n = 95)	%	Number of patients	P value
Age, years						0.069
>35	3,213	88.7	90	94.7	3,303
≤35	406	11.3	5	5.3	413
T stage						0.922
T1	1,585	73.8	42	44.2	1,621
T2	1,780	49.2	49	51.6	1,825
T3	181	5	3	3.2	184
T4	72	2	1	1.1	73
N stage						0.56
N0	1,912	52.9	57	60	1,969
N1	924	25.6	22	23.2	946
N2	459	12.7	10	10.5	469
N3	316	8.8	6	6.3	322
TNM stage						0.57
Stage 1	1,066	29.5	28	29.5	1,094
Stage 2	1,703	47.2	49	51.6	1,752
Stage 3	840	23.3	18	18.9	858
Bilaterality						0.013
Unilateral	3,495	96.5	89	93.7	3,526
Bilateral	126	3.5	6	6.3	132
ER receptor						0.003
Negative	1,088	37.4	15	20.3	1,103
Positive	1,821	62.6	59	79.7	1,880
PR receptor						0.23
Negative	1,221	42.9	25	35.7	1,246
Positive	1,625	57.1	45	64.3	1,670
HER-2						0.038
Negative	1,373	70.8	46	83.6	1,419
Positive	567	29.2	9	16.4	576

ER = estrogen receptor; PR = progesterone receptor; HER-2 = human epidermal growth factor receptor-2.

ISSN: 1477-7819