Table 1.

Clinicopathological characteristics of 483 invasive breast cancer patients studied for expression of selected membrane markers

Feature	Grouping	N or value	%
Age (years)	Mean	60
	Range	28 to 88
Histological type	Invasive ductal cancer	319	66.0
	Invasive lobular cancer	126	26.1
	Others	38	7.9
Tumor size (cm)	≤2	206	42.7
	>2 and ≤5	219	45.3
	>5	49	10.1
	Not available	9	1.9
Histological grade	1	89	18.4
	2	169	35.0
	3	219	45.4
	Not available	6	1.2
Lymph node status	Negative *	225	46.6
	Positive **	232	48.0
	Not available	26	5.4

^*: negative = N0 or N0(i+); ^**: positive = ≥N1mi (according to TNM 7^th edition, 2010).