Targeted therapy at the end of life and the impact on health care utilization.

Abstract

116 Background: The use of targeted therapy has steadily increased over the past decade, though the impact of targeted agents on patterns of care at the end-of-life life remains unknown. The purpose of this study was to explore the influence of targeted therapy on end-of-life care in a large population-based database. Methods: We identified 14,398 patients from the SEER-Medicare linked database with metastatic breast, lung, or colorectal cancer diagnosed between 2000 and 2009 who received conventional cytotoxic chemotherapy or targeted therapy in the last 3 months of life. Multivariate logistic and linear regression models were used to determine the impact of targeted therapy on the following endpoints in the last 3 months of life: emergency department (ED) visits, hospitalizations, and hospice utilization. Analyses were adjusted for differences in patient age, gender, race, comorbidity, socioeconomic status, and geography. Results: Among the whole study cohort 83% of patients received chemotherapy alone, 12% received chemotherapy with targeted therapy, and 5% received targeted therapy alone. The delivery of any targeted therapy in the last 3 months increased across the study period, from 1.5% in 2000 to 28% in 2009. Compared to patients treated with chemotherapy alone, those treated with targeted therapy alone had lower rates of ED visits (adjusted odds ratio [aOR]=0.81, p=0.01), lower rates of hospitalization (adjusted odds ratio [aOR]=0.69, p<0.0001), no difference in overall hospice utilization rates, though had longer stays on hospice (5.1 days longer, p<0.0001). Compared to patients treated with chemotherapy alone, those treated with both chemotherapy and targeted therapy had no difference in ED visits or hospitalization admission rates, though had decreased rates of hospice utilization (aOR = 0.79, p<0.0001), and shorter stays on hospice (2.7 days longer, p<0.0001). Conclusions: This study found that targeted therapy was associated with varying patterns of healthcare utilization at the end-of-life, though these differences could be influenced by unknown confounding variables. Future research should focus on defining the specific impact of targeted therapy on quality of life at the end-of-life.