EBRO 2017

Protective effect of mastectomy on the risk of breast cancer

BRCA1 Oophorectomy N = 617

BRCA2 Oophorectomy N = 342

BRCA1 No Oophorectomy N = 415

BRCA2 No Oophorectomy N = 245

Mastectomy Breast T

116 0

56 0

43 0

32 0

No mastectomy Breast T

501 44 (8.8%)

286 20 (7%)

372 43 (10.4%)

213 15 (7%)

Domchek et al, 2010