Table 1.

Selected characteristics of participants in the Asian Breast Cancer Consortium by study stage

Study stageEthnicityCasesControlsMean agea% PostmenopausalaER+b
Stage I
 SBCGS IChinese2,9262,38051.7/50.2   42.9/41.41,581 (54.3%)
Stage II
 SBCGS IIChinese1,8902,00052.8/53.3   48.8/55.0924 (59.9%)
Stage III
 SBCGS IIIChinese2,4752,34353.8/55.0   50.4/52.51,542 (62.3%)
 TaiwanChinese1,0491,04651.6/47.5   52.6/39.6634 (66.1%)
 Hong KongChinese42962145.8/45.6   50.3/41.8157 (70.4%)
 NanjingChinese1,7571,82350.6/50.2   50.9/47.0651 (54.9%)
 GuangzhouChinese80485349.0/49.2   39.8/50.7156 (73.6%)
 NagoyaJapanese64064451.4/51.1   48.4/48.5353 (73.2%)
 NaganoJapanese39839753.8/54.1   54.8/65.7294 (74.4%)
Total12,36812,10751.8/51.3   47.8/47.0
  • aCases/controls; bold values denote significant difference at P ≤ 0.01.

  • bNumber and percentage of estrogen receptor positive (ER+) breast cancer cases among those with data available.