Table 1.

Selected characteristics of studies included in the current analysis from the Asia Breast Cancer Consortium

Study	Cases	Controls	Population	Study designa	Age (years)b	ER(+) (%)c	Postmenopausal (%)d
Stage I	7619	6286
SBCGS	2731	2135	Chinese	Population-based	51/50	55	41/41
SeBCS1	2246	2052	Korean	Hospital-based	48/51	63	36/56
BBJ1	2642	2099	Japanese	Hospital-based	57/56	63	79/72
Stage II	6605	8543
KOHBRA/KoGES	1397	3209	Korean	Hospital-based	40/50	63	23/NA
HCES-Br	3387	3186	Korean	Population-based	50/57	64	45/81
SeBCS2	776	1,103	Korean	Hospital-based	48/48	63	36/37
Nagoya	644	644	Japanese	Hospital-based	51/51	73	49/49
Nagano	401	401	Japanese	Hospital-based	54/54	75	55/65
Total	14 224	14 829

Abbreviations: ER, Estrogen receptor; NA, Not available.

^aCase-control study design was used.

^bMean age of cases/controls with available data.

^cProportion of ER-positive women among cases.

^dProportion of postmenopausal status of cases/controls with available data.