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Table 2 Distribution of demographic and tumor characteristics of stages 1–3 first primary invasive breast cancer by socioeconomic status: California Cancer Registry 2000–2010*

From: Disparities in race/ethnicity and socioeconomic status: risk of mortality of breast cancer patients in the California Cancer Registry, 2000–2010

  Socioeconomic status category
   Lowest/least affluent Intermediate Highest/most affluent Total
N (%)   49,868 (27.8%) 37,128 (20.7%) 92,147 (51.36%) 179,143
Year at diagnosis      
    2000-2006 n 31,380 23,844 59,359 114,583
% within SES 62.9% 64.2% 64.4% 64.0%
    2007-2010 n 18,488 13,284 32,788 64,560
% within SES 37.1% 35.8% 35.6% 36.0%
Race/ethnicity      
    White n 25,016 25,283 70,136 120,435
% within SES 50.2% 68.1% 76.1% 67.2%
    Black n 5,454 2,349 2,834 10,637
% within SES 10.9% 6.3% 3.1% 5.9%
    Hispanic n 14,848 5,756 7,776 28,380
% within SES 29.8% 15.5% 8.4% 15.8%
    API n 4,550 3,740 11,401 19,691
% within SES 9.1% 10.1% 12.4% 11.0%
Age (years) at diagnosis      
    <35 n 1,347 713 1,628 3,688
% within SES 2.7% 1.9% 1.8% 2.1%
    35-69 n 35,557 25,924 66,589 128,070
% within SES 71.3% 69.8% 72.3% 71.5%
    70-79 n 8,414 6,708 15,388 30,510
% within SES 16.9% 18.1% 16.7% 17.0%
    80-89 n 4,022 3,349 7,565 14,936
% within SES 8.1% 9.0% 8.2% 8.3%
    90+ n 528 434 977 1,939
% within SES 1.1% 1.2% 1.1% 1.1%
AJCC stage      
    Stage 1 n 21,814 18,066 47,655 87,535
% within SES 43.7% 48.7% 51.7% 48.9%
    Stage 2 n 21,082 14,776 35,550 71,408
% within SES 42.3% 39.8% 38.6% 39.9%
    Stage 3 n 6,972 4,286 8,942 20,200
% within SES 14.0% 11.5% 9.7% 11.3%
ER/PR/HER2 subtype      
    ER+/PR+/HER2- n 18,434 15,088 40,900 74,422
% within SES 52.6% 56.6% 59.8% 57.2%
    ER+/PR+/HER2+ n 3,521 2,519 6,204 12,244
% within SES 10.0% 9.5% 9.1% 9.4%
    ER+/PR-/HER2- n 3,264 2,548 6,702 12,514
% within SES 9.3% 9.6% 9.8% 9.6%
    ER+/PR-/HER2+ n 1,180 856 2,082 4,118
% within SES 3.4% 3.2% 3.0% 3.2%
    ER-/PR+/HER2- n 285 212 527 1,024
% within SES 0.8% 0.8% 0.8% 0.8%
    ER-/PR+/HER2+ n 167 120 226 513
% within SES 0.5% 0.5% 0.3% 0.4%
    ER-/PR-/HER2- n 5,454 3,550 7,821 16,825
% within SES 15.6% 13.3% 11.4% 100.0%
    ER-/PR-/HER2+ n 2,744 1,753 3,941 12.9%
  % within SES 7.8% 6.6% 5.8% 8,438
Tumor grade n 9,276 7,998 22,058 39,332
    Grade I % within SES 19.9% 22.9% 25.3% 23.3%
n 18,814 14,625 37,837 71,276
    Grade II % within SES 40.3% 41.9% 43.4% 42.3%
n 17,586 11,572 25,888 55,046
    Grade III % within SES 37.7% 33.2% 29.7% 32.6%
n 1,001 698 1,344 3,043
    Grade IV % within SES 2.1% 2.0% 1.5% 1.8%
  1. *Excludes cases classified as American Indian and Hispanic + Other race.