Lifetime risks of specific breast cancer subtypes among women in four racial/ethnic groups

Table 2 Absolute lifetime risk^a of developing breast cancer by subtype^b and race/ethnicity^c

	White	Black	Hispanic	Asian	All races
Breast cancer subtype	Percentage (95% CI)	Percentage (95% CI)	Percentage (95% CI)	Percentage (95% CI)	Percentage (95% CI)
Luminal^{b, d}	8.10 (7.94, 8.20)	4.70 (4.41, 5.02)	4.60 (4.41, 4.80)	5.06 (4.81, 5.34)	6.79 (6.69, 6.88)
HER2-positive^{b, d}	1.82 (1.76, 1.88)	1.81 (1.63, 2.00)	1.56 (1.46, 1.68)	1.91 (1.78, 2.07)	1.78 (1.73, 1.83)
Triple-negative^{b, d}	1.25 (1.20, 1.30)	1.98 (1.80, 2.17)	1.04 (0.96, 1.13)	0.77 (0.67, 0.88)	1.20 (1.16, 1.24)
Missing^e	2.68 (2.60, 2.76)	2.32 (2.11, 2.56)	1.81 (1.68, 1.95)	2.23 (2.04, 2.44)	2.44 (2.38, 2.50)
All subtypes	13.8 (13.6, 14.0)	10.8 (10.4, 11.3)	9.01 (8.74, 9.29)	9.98 (9.61, 10.4)	12.3 (12.2, 12.4)

^aLifetime risk is conditioned on never having had breast cancer previously. ^bSubtypes were defined by expression of estrogen receptor (ER), progesterone receptor (PR), and Her2/neu (HER2) as follows: luminal (ER- or PR-positive or both and HER2-negative), HER2-positive (ER- and PR-positive or -negative and HER2-positive), and triple-negative (ER-negative, PR-negative, and HER2-negative). ^cRacial/ethnic categories are mutually exclusive and include white (non-Hispanic white), black (non-Hispanic black), Hispanic, and Asian (non-Hispanic Asian or Pacific Islander). ^dExcludes 7,737 cases (5,069 whites, 505 blacks, 1,262 Hispanics, and 901 Asians) for whom ER, PR, and/or HER2 were not tested or for whom results were borderline, missing, or unknown; these cases are included in the 'All subtypes' category. ^eIncludes 7,737 cases (5,069 whites, 505 blacks, 1,262 Hispanics, and 901 Asians) for whom ER, PR, and/or HER2 were not tested or for whom results were borderline, missing or unknown. CI, confidence interval.