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Table 2 Descriptive characteristics of second primary prostate cancer cases by age at index breast cancer from the SEER 18 registries, 1988–2012

From: Descriptive characteristics of prostate cancer in patients with a history of primary male breast cancer – a SEER analysis

  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   
  1. *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