This study is a randomized controlled trial, taking place at the University Hospital Basel (CH). It aims at the alleviation of breast cancer patients' life quality during chemotherapy. The intervention group will participate in 10 sessions of structured hypnotherapy during the course of chemotherapy in addition to the standard of care. The control group will have access to the standard of care without any additional treatment. The main goal of the study is to investigate whether quality of life is higher among patients in the intervention group. Additionally, it will be analyzed if the interventions have a positive effect on chemotherapy side effects, symptoms of anxiety and depression and the immune system. Finally, the relative dose intensity (RDI) as well as treatment schedule adherence will be assessed. There are no risks to be expected from the intervention itself. In the case of positive findings, the standard of psycho-oncological care can be updated by integrating structured hypnotherapeutic interventions into the treatment of patients with breast cancer.