This pilot study concentrates on studying the trajectory of breast cancer patient's fear of recurrence (FoR) over the course of radiation therapy. The aim is to collect repeated ratings of 100 breast cancer patient's FoR over the course of their treatment. It is hypothesized that cancer patient's FoR level will rise on nearing the termination of the in radiotherapy treatment, and radiotherapist-patient interaction modifies the development of patient's FoR.