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BRCA1/2 mutation carriers diagnosed with breast cancer have a strongly elevated life-time risk of developing a contralateral tumour. We studied the contralateral breast cancer risk in 164 patients from 83 families with a proven BRCA1 mutation in relation to the age at diagnosis of the first primary breast cancer. In the actuarial outcomes after 10 years' follow-up, 40% of the 124 BRCA1-patients diagnosed with breast cancer &lt; 50 years had developed contralateral breast cancer, vs 12% of the 40 patients &gt; 50 years at first diagnosis (Plogrank = 0.02). These data suggest that age at diagnosis of the first tumour should be taken into account when prophylactic mastectomy in BRCA1-patients is considered.

Contralateral breast cancer risk is influenced by the age at onset in BRCA1-associated breast cancer