We assessed the reliability, validity, and responsiveness to change of the 6-item Functional Assessment of Cancer Therapy-Breast Symptom Index (FBSI) in a sample of 615 metastatic breast cancer patients. The FBSI is a brief, clinically relevant, and psychometrically sound instrument that can be used to measure symptoms in patients with breast cancer.
Validation of the Functional assessment of cancer therapy-Breast Symptom Index (FBSI)
Yost, KJ., Yount, SE., Eton, DT., Silberman, C., Heyes, A., & Cella, D. (2005). Validation of the Functional assessment of cancer therapy-Breast Symptom Index (FBSI). Breast Cancer Research and Treatment, 90(3), 295-298. https://doi.org/10.1007/s10549-004-5024-3