Social disparities in the frequency and severity of triple-negative breast cancer at diagnosis in a university hospital in Paris, France: confronting race and ethnic blindness.

In mainland France, it is the least common subtype of breast cancer but highly significant in clinical and social terms: it represents 15% of cases and mainly concerns women under 40, pre-menopausal, too young to be part of the target population of the national organized screening program (which in France concerns women aged 50–75) and tested at an often advanced stage [ 2 , 3 ].

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