Women with TNBC breast cancer who meet the following criteria:

Women aged 18 and over;

Any tumor size (pT stage);

Regional lymph node pN0 to pN3;

Patient with pathologically confirmed TNBC (estrogen and progesterone receptor negative and HER2 negative);

Neo- or adjuvant chemotherapy followed by radiotherapy;

No evidence of distant metastasis at time of diagnosis;

Primary tumor removed by conservative surgery with negative margins;

Patient covered by the French social security system (for French patients).

Prediction of Radiotherapy Efficacy in Patients With Triple-negative Breast Cancer