Numerous studies have shown the impact of anti-cancer treatments on cognition and more particularly that of chemotherapy. Elderly patients also seem to be at higher risk of developing cognitive impairment. These disorders can have a particularly negative impact in this population, in particular by having repercussions on the observance of oral treatments or even on autonomy. However, investigators still have little data concerning the management of cognitive disorders induced by oncology treatments, particularly in the elderly patient. It is therefore necessary to offer care adapted to this population which will allow the reduction of the sequelae induced by cancer treatments and the improvement of the quality of life of elderly patients.Although there are no preventive measures yet, recent studies of young women being treated for breast cancer with a cognitive complaint have shown a beneficial effect of cognitive stimulation on these cognitive disorders. Stimulation programs of this type have been developed in electronic format. However, to date, they have not been the subject of specific studies with elderly patients in whom the use of computer interface can be an obstacle.Sponsor propose to set up a study aimed at evaluating the feasibility of using cognitive stimulation software on tablets with elderly patients.The HAPPYNeuron® software, developed by a French team of neurologists, speech-language pathologists and psychiatrists, offers exercises to be performed online to stimulate the cognitive functions most impaired by oncological treatments (memory, attention, executive functions and speed of treatment).For this feasibility study, the sponsor plan to include 50 patients aged 70 and over to have them test the acceptance of cognitive stimulation by this software with a tablet interface.

Inclusion Criteria:

• Patient with breast cancer, aged 70 and over,
• During treatment with chemotherapy, targeted therapy or radiotherapy.
• Whatever the stage of the disease,
• Hospitalised in a week hospital, in traditional hospitalisation for an intercurrent episode or day hospitalisation, or undergoing radiotherapy
• Absence of major cognitive impairment preventing cognitive tests (compliance with the MoCA score threshold based on the patient's age and educational level according to GRECOGVASC standards),
• Patient with education level 3 "end of primary education" minimum (Barbizet scale),
• Mastery of the French language,
• Patient who signed the consent to participate in the study.

Exclusion Criteria:

• Hospitalization for neurological reasons (e.g. confusion), or psychiatric,
• Documented brain metastases,
• History of brain radiation therapy,
• Progressive psychiatric pathology or known dementia,
• Abuse of alcohol or drug use,
• Severe visual and / or hearing loss,
• Patient's refusal to participate,
• Patient deprived of liberty or under guardianship.