This retrospective study is to collect and analyze the data from medical records within the period that breast cancer patient is receiving NHI-covered CRF treatment. This study will evaluate the clinical use, fatigue improvement, and treatment satisfaction of breast cancer patients with CRF treatment.

This is a single arm, multicenter, and retrospective study. About 200 breast cancer patients' data from medical records are expected to collect and analyze in this retrospective study. The data collection from medical records of breast cancer patients who approved to use NHI to pay for CRF treatment drug will include the demographic information, disease characteristics and cancer treatment information, fatigue score by visual analog fatigue scale, fatigue clinical global impression, CRF pharmacological treatment record, hematological lab data, ECOG, cancer drug compliance record, overall clinical evaluation after CRF treatment by physicians and patient's expectation to continue CRF treatment etc. Data of three return visits (i.e. at the time of before CRF treatment, after 4 times of CRF treatment and CRF treatment completed) per patient will be collected from medical records to analysis within the period that patient is receiving NHI-covered CRF treatment.

Inclusion Criteria:

• breast cancer patients who approved to use NHI to pay for cancer-related fatigue treatment drug

Exclusion Criteria:

• N/A

breast cancer patients who approved to use NHI to pay for cancer-related fatigue treatment drug