Yost KJ, Yount SE, Eton DT, Silberman C, Broughton-Heyes A, Cella D. Validation of the Functional assessment of cancer therapy-Breast Symptom Index (FBSI). Breast Cancer Res Treat. 2005 Apr 1;90(3):295-8.

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.

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