BreAst Cancer and Cardiotoxicity Induced by RAdioTherapy: the BACCARAT Study

Inclusion Criteria: * Age between 50 and 70 years * Women surgically treated for left or right breast cancer and for whom adjuvant treatment is radiotherapy with irradiation of the breast or chest wall irradiation and possibly ganglion chains, * Adjuvant radiotherapy with 3DCRT performed in Clinique Pasteur Toulouse * WHO performance status ECOG - Eastern Cooperative Oncology Group (index normally used to describe the patient's condition) = 0 or 1 * Being volunteer to participate in the study and have signed the consent form Exclusion Criteria: * Indication of adjuvant chemotherapy * Clinically or radiologically detectable metastasis * Personal history of coronary artery disease or myocardial disease * Personal history of breast cancer or other cancer requiring radiotherapy to the thorax * Patient with controlled infection or severe disease and / or non-hazardous to their participation in the study * Contraindications to injection of iodinated contrast (for CCTA): pregnancy, renal failure, allergy. * Pregnancy, lactation * Abnormal echocardiography before radiotherapy: * LVEF \<50% * Longitudinal strain\> - 16% * Longitudinal strain rate \<1% / s * Abnormal wall motion * CCTA before radiotherapy showing that therapeutic management is required (coronary-artery calcium (CAC) score\>600)