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. Author manuscript; available in PMC: 2020 Nov 1.
Published in final edited form as: Cancer Causes Control. 2019 Aug 27;30(11):1171–1182. doi: 10.1007/s10552-019-01222-x

Table 1.

Age-standardized characteristics of breast cancer cases by race and ethnicitya in the SEER Cancer Registries (n= 454,154)

Overall
(N=454,154)		 White
(N=331,418)		 Black
(N=45,218)		 Asian/PI
(N=35,623)		 Hispanic
(N=41,895)
Breast quadrants
 Nipple/central portion of breast 8.6 8.5 7.7 10.3 8.9
 Upper-inner quadrant 17.0 16.6 17.0 19.7 17.7
 Lower-inner quadrant 8.4 8.3 9.8 8.3 8.2
 Upper-outer quadrant 54.3 54.9 53.4 50.6 53.6
 Lower-outer quadrant 10.7 10.7 10.8 10.4 10.7
 Axillary tail of breast 1.0 1.0 1.3 0.7 0.8
Age at diagnosis, mean yearb (SD) 57.7(11.9) 58.7(11.7) 55.2(11.9) 55.2(11.7) 54.4(12.1)
Age at diagnosis, %
 20–39 6.3 5.1 9.4 8.7 10.8
 40–49 20.7 18.8 24.6 26.1 26.9
 50–59 27.4 27.1 28.9 28.7 27.5
 60–69 26.2 27.6 23.0 23.1 21.6
 70–79 19.3 21.4 14.1 13.5 13.2
Length of follow-up, mean month (SD) 105.5(68.4) 109.4(69.3) 90.8(63.7) 103.4(68.7) 93.9(64.2)
Length of follow-up, %
 12–59 31.8 29.6 40.1 33.6 38.3
 60–119 30.3 30.2 30.9 30.0 30.8
 ≥120 37.8 40.2 29.0 36.4 30.9
Year of diagnosis
 1990–1994 8.8 9.6 6.9 7.3 6.2
 1995–1999 11.7 12.1 9.6 12.8 9.8
 2000–2004 25.4 26.2 23.6 22.0 22.9
 2005–2009 26.1 25.7 27.5 26.2 27.6
 2010–2014 28.0 26.4 32.3 31.7 33.5
Laterality
 Right 49.1 49.3 48.7 49.3 48.5
 Left 50.9 50.7 51.3 50.7 51.5
Histological subtype
 Invasive ductal carcinoma 74.7 74.1 76.5 78.6 74.8
 Invasive lobular carcinoma 7.6 8.2 6.0 4.9 6.9
 Other histology 17.7 17.7 17.6 16.6 18.3
Gradec
 Well differentiated 21.4 22.8 14.2 20.1 19.1
 Moderately differentiated 42.1 43.0 36.1 43.7 41.1
 Poorly differentiated and undifferentiated 36.5 34.2 49.7 36.1 39.8
Stage
 I 51.1 53.3 41.4 51.1 44.9
 II 36.8 35.4 42.8 37.7 40.1
 III 12.1 11.2 15.7 11.2 15.0
Tumor size, mmd
 ≤20 64.4 66.9 54.5 62.5 58.0
 20 – 50 30.5 28.6 37.6 32.5 35.7
 >50 5.1 4.5 7.9 5.0 6.3
Lymph nodes statuse
 Negative 68.1 69.2 62.6 69.9 64.0
 Positive 31.9 30.8 37.4 30.1 36.0
Estrogen receptorf
 Negative 20.8 18.9 33.7 19.4 22.5
 Positive 79.2 81.1 66.3 80.6 77.5
Progesterone receptorg
 Negative 30.9 28.9 44.4 29.4 32.9
 Positive 69.1 71.1 55.6 70.6 67.1
Hormone receptorh
 Negative (ER-&PR-) 19.2 17.4 31.7 17.9 20.9
 Positive (ER+/PR+) 80.8 82.6 68.3 82.1 79.1
Surgeryi
 None 1.3 1.0 2.7 1.4 2.1
 Breast-conserving surgeryj 59.3 60.4 57.0 53.2 57.1
 Mastectomyk 39.4 38.5 40.2 45.4 40.9
Radiation
 No/unknown 44.7 43.5 47.4 48.4 49.1
 Yes 55.3 56.5 52.6 51.6 50.9
Chemotherapy
 No/unknown 57.0 58.4 49.7 57.3 53.7
 Yes 43.0 41.6 50.3 42.7 46.3

SD standard deviation

Values are means (SD) or percentages and are standardized to the age distribution of the overall study population in race/ethnicity groups

a

P values were calculated from a comparison across all groups except the groups with missing values

b

Values were not age adjusted.

c

Overall missing: 35,403, White:26,563, Black:3,716, Asian/PI:2,325, Hispanic:2,799

d

Overall missing: 5,250, White: 3,480, Black: 704, Asian/PI: 507, Hispanic: 559

e

Overall missing: 509, White:348, Black:82, Asian/PI:24, hispanic:55

f

Overall missing: 34,545, White:24,827, Black:3,831, Asian/PI:2,295, Hispanic:3,592

g

Overall missing:40,300, White: 28,865, Black: 4,376, Asian/PI: 2,821, Hispanic: 4,238

h

Overall missing: 40,572, White: 29,070, Black: 4,402, Asian/PI: 2,838, Hispanic: 4,262

i

Overall missing: 606, White: 442, Black: 85, Asian/PI: 33, Hispanic: 46

j

Breast-conserving surgery consisted of excisional biopsy, lumpectomy, nipple resection, wedge resection, quadrantectomy, segmental mastectomy, tylectomy, and partial mastectomy, NOS

k

Mastectomy included total mastectomy, modified radical mastectomy, radical mastectomy, subcutaneous mastectomy and mastectomy, not otherwise specified