Design: randomized controlled clinical trial with non-pharmacologic intervention. Subjects and setting of study: patients with breast cancer who initiate adjuvant, neoadjuvant or palliative chemotherapy, in the Day Unit of a University Hospital. Interventions: random allocation of the patients in two arms according to the nursing cares. The arm A is the one of standard education and care. They consist of receiving programmed oral and written information by the specialist in Medical Oncology before initiating the chemotherapy treatment and before each cycle of treatment. Also, the patients will be able to ask for information to the nurses when they need it. Arm B is the one of experimental education and care. They consist of receiving oral and written information by the specialist before initiating the chemotherapy treatment and before each cycle. In addition, the patients assigned to arm B will receive programmed education and care about the chemotherapy by a nurse of the Medical Oncology service before the beginning of the treatment and in each cycle, in a specific nurse consultation. Determinations: use of health resources (not programmed attendance in Primary, Specialist and Emergency care or hospitalisation). Toxicity caused by the chemotherapy. Patients who leave the chemotherapy by serious toxicity. Quality of life measured by means of the EORTC QOL-C30 questionnaire. Satisfaction with the received medical assistance.