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Table 1 Baseline characteristics of women with primary breast cancer as the first (BCa-1) and second (BCa-2) malignancy: a SEER population-based study in US, 1990–2015

From: Increased risk of breast cancer-specific mortality among cancer survivors who developed breast cancer as a second malignancy

  BCa-1 BCa-2
N % N %
Total number 883,881 36,313
Year of diagnosis
 1990–1993 47,727 5.4 1806 5.0
 1994–1997 62,863 7.1 2380 6.6
 1998–2001 117,368 13.3 3332 9.2
 2002–2005 165,528 18.7 5250 14.5
 2006–2009 185,587 21.0 7775 21.4
 2010–2015 304,808 34.5 15,770 43.4
Age at diagnosis (mean ± SD), years 60.5 ± 14.0 68.9 ± 12.4
Race
 White 708,820 80.2 30,929 85.2
 Black 97,049 11.0 3086 8.5
 Asian 68,641 7.8 2127 5.9
 Other 9371 1.1 171 0.5
Cohabitation status
 Non-cohabitation 359,775 40.7 17,217 47.4
 Cohabitation 484,233 54.8 17,252 47.5
 Unknown 39,873 4.5 1844 5.1
% of High-school education in the county of residence
 Lowest tertile 173,646 19.6 6202 17.1
 Middle tertile 303,827 34.4 10,779 29.7
 Highest tertile 406,408 46.0 19,332 53.2
Cost of living adjusted median household income in the county of residence
 Lowest tertile 54,584 6.2 1885 5.2
 Middle tertile 116,136 13.1 4648 12.8
 Highest tertile 713,161 80.7 29,780 82.0
  1. Abbreviations: N Number, SD Standard deviation