Table 1.

Summary characteristics for the study group

NoncarriersBRCA2 mutation carriers
UnaffectedAffectedUnaffectedAffected
N53756168101
Age at blood draw (mean, SE)49.9 (0.9)59.8 (0.6)42.4 (1.5)53.8 (1.3)
Sample acquisition time (n)
 Before breast cancer diagnosis7618
 After breast cancer diagnosis48583
Age at breast cancer diagnosis (mean, SE)52.7 (0.5)49.7 (1.1)
Follow-up time to breast cancer diagnosis in years (mean, SE)13.3 (0.1)7.5 (0.4)13.7 (0.8)7.7 (0.9)
Survival follow-up time in years (mean, SE)19.2 (0.5)15.5 (0.9)