Table 2.

Descriptive characteristics of second primary prostate cancer cases by age at index breast cancer from the SEER 18 registries, 1988–2012

	All cases (N = 250)		Age < 70 years at index breast cancer (n = 156)		Age 70+ years at index breast cancer (n = 94)
	n	(%)	n	(%)	n	(%)	P value*
Age at second primary prostate cancer, years
Mean (SD)	70.9	(8.1)
Race/ethnicity
Non-Hispanic White	192	(76.8)	119	(76.3)	73	(77.7)	0.893
Black	39	(15.6)	26	(16.7)	13	(13.8)
Asian/Pacific Islander/Alaska Native	7	(2.8)	4	(2.6)	3	(3.2)
Hispanic	12	(4.8)	7	(4.5)	5	(5.3)
Latency period to prostate cancer diagnosis, months
Median (interquartile range)	36	(14–84)	47	(17–103)	28	(10–57)	<0.001
Prostate cancer AJCC stage
I	2	(0.8)	1	(0.6)	1	(1.1)	0.003
II	122	(48.8)	89	(57.1)	33	(35.1)
III	12	(4.8)	10	(6.4)	2	(2.1)
IV	18	(7.2)	6	(3.8)	12	(12.8)
Unknown	96		50		46

*To test for differences between groups we used Fisher’s exact test for categorical variables with cells <5 and Wilcoxon rank-sum test for medians