A Matched Case-Control Study of Risk Factors for Breast Cancer Risk in Vietnam

Table 1

Clinical features and pathological data for cases.

Feature	Result	Cases ()	% of Total Cases
Estrogen receptor (ER)	Positive	181	61.6
	Negative	93	31.6
	Unavailable	20	6.8
Progesterone receptor (PR)	Positive	172	58.5
	Negative	102	34.7
	Unavailable	20	6.8
Her2/neu	Positive	63	21.4
	Negative	209	71.1
	Unavailable	22	7.5
Pathological type	Ductal carcinoma in situ	3	1.0
	Invasive ductal carcinoma	205	69.7
	Invasive lobular carcinoma	15	5.1
	Mucinous carcinoma	8	2.7
	Papillary carcinoma	10	3.4
	Tubular carcinoma	8	2.7
	Unavailable	45	15.3
Histological	1	25	8.5
	2	129	43.9
	3	49	16.7
	Unavailable	91	31.0
Tumour (T) stage	1	20	6.8
	2	199	67.7
	3	18	6.1
	4	10	3.4
	Unavailable	47	16.0
Node (N) stage	0	111	37.8
	1	97	33.0
	2	39	13.3
	Unavailable	47	16.0
Metastasis (M) stage	0	246	83.7
	1	1	0.3
	Unavailable	47	16.0
AJCC clinical	1	13	4.4
	2a	102	34.7
	2b	77	26.2
	3a	40	13.6
	3b	14	4.8
	4	1	0.3
	Unavailable	47	16.0

based on the Nottingham grading system.
refers to American Joint Committee on Cancer (AJCC) staging system for breast cancer.