Impact of Web Application Support Versus Standard Management on Compliance With Adjuvant Hormone Therapy at 18 Months in Patients Treated for Breast Cancer

Inclusion Criteria: * Patient \> 18 years old * Breast cancer patient candidate for adjuvant hormone therapy * Mastery of the French language * Patient with a cell phone and an Internet connection * Patient able to use a computer, smartphone, or tablet. * Patient affiliated to a social security system * Signing of informed consent prior to any specific study-related procedure Exclusion Criteria: * Patient who has previously received hormone therapy for cancer. * Patient not trained in the use of the application * Any associated medical or psychiatric condition that might compromise the patient's ability to participate in the study * Patients with locoregional or metastatic recurrence * Other history of cancer. * Patient deprived of liberty, under guardianship or curatorship * Simultaneous participation in a therapeutic clinical trial or other clinical study involving a connected tool * Patient unable to undergo trial follow-up for geographical, social or psychopathological reasons