We assessed the quality of life (QoL) associated with patient's characteristics and different cancer treatments among Chinese breast cancer survivors in Taiwan. A cross‐sectional survey was conducted in 2017 where 193 patients with hormone receptor‐positive/human epidermal growth factor receptor‐2‐negative metastatic breast cancer were recruited. Three QoL questionnaires were administered: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ‐C30), its breast cancer supplementary measure (QLQ‐BR23) and EQ‐5D‐5L. Multiple linear regression was performed to assess the association between QoL and cancer treatments, with adjustment for patient's characteristics. The mean age of study participants was 55.52 years. Simple linear regression showed that cancer stage and receiving chemotherapy were significantly associated with QoL scores (p < 0.05). Significant adverse effects of chemotherapy on QoL were found among early‐stage cancer women (i.e., I or II), including poor cognitive and sexual functioning, and a higher symptom burden (i.e., dyspnoea, constipation, systematic therapy side effects). Multiple linear regression also revealed that receiving chemotherapy was significantly associated with poor QoL (e.g., lower functional health and higher symptom burden measured by the QLQ‐BR23), compared to none chemotherapy (p < 0.05). Receiving chemotherapy was associated with poor QoL, especially among early‐stage breast cancer patients.

Breast cancer at a young age is associated with poor outcomes. However, few reports have compared the outcomes of breast cancer between extremely young patients and elderly patients. We retrospectively collected information on patients diagnosed with breast cancer before 30 years of age. This case-control study employed matched operative methods, stage, and subtypes with a case-to-control ratio of 1:3. The primary endpoint was disease-free survival, and the secondary endpoint was overall survival. We analyzed potential prognostic factors in univariate and multivariate analyses. This analysis included 18 patients in the young group with a median age of 28.5 years and 54 patients in the control group with a median age of 71 years. The 5-year disease-free survival rate was 68.8% in the former group and 84.6% in the latter group (P = .080). The 5-year overall survival was 87.1% and 91.2% in the young and old groups, respectively (P = .483). Multivariate analysis showed that tumor size and triple-negative breast cancer was major prognostic factors of poorer disease-free survival in the young group. Extremely young breast cancer patients had a trend to develop a poorer disease-free survival than old patients, but not a poorer overall survival. Aggressive treatment for young patients at early stages of disease would improve survival.

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