Prevalence and determinants of end-of-life chemotherapy use in patients with metastatic breast cancer.

Cessation of chemotherapy in the last few weeks of life could be an important quality-of-care benchmark. Proportion of metastatic breast cancer patients who receive end-of-life chemotherapy is not well described. We aimed to determine the prevalence and determinants of end-of-life chemotherapy use in patients with metastatic breast cancer. A retrospective cohort study using a prospectively collated database of patients with metastatic breast cancer who died between January 1, 2010, and September 30, 2014, was conducted. End-of-life chemotherapy (EOLC) use was defined as receipt of chemotherapy within 2 weeks of death (EOLC2) and receipt of chemotherapy within 4 weeks of death (EOLC4). Patients who did not receive any chemotherapy in the last 4 weeks before death were categorized as non-EOLC. We identified 274 patients with metastatic breast cancer, of whom 28 received EOLC2 (10.2%) and 62 received EOLC4 (22.6%). In comparison with non-EOLC, patients receiving EOLC4 were younger and had greater disease burden. Patients in EOLC4 group received more number of lines of chemotherapy. In a multivariable analysis, younger age at metastatic disease and greater number of metastatic organ systems involved were predictors of end-of-life chemotherapy use. Prevalence of the use of end-of-life chemotherapy in our cohort was higher than previously described. More end-of-life chemotherapy was used in younger women, and those with greater disease burden. Earlier initiation of end-of-life discussions may be targeted to such patients.