Hospitalization trends and outcomes for adults with metastatic cancers in the United States: 2004-2013.
e18111 Background: Metastatic cancer accounts for 90% of cancer deaths. However, the impact of metastatic cancer on hospitalization patterns and in-hospital mortality is unknown. We sought to examine trends in hospitalizations and mortality among adults with metastatic cancers in the United States. Methods: We obtained data from the National Inpatient Sample for hospitalized adults, aged ≥18 years, with metastatic cancer listed as a discharge diagnosis from 2004 to 2013. We estimated and trended the following: i) proportion of hospitalized adults with metastatic cancers; ii) leading causes of hospitalization for adults with metastatic cancer; and iii) in-hospital mortality among adults with metastatic cancer. Independent associations of in-hospital mortality with age, gender, race/ethnicity, payment source, and hospital type were examined with multivariable logistic regression. Survey weights were applied in estimating the population-based rates, odds ratios, and confidence intervals (CI). Results: 3.0% (95% CI 2.9-3.1%) and 3.2% (95% CI 3.0-3.3%) of hospitalized adults had metastatic cancers in 2004 and 2013, respectively ( P for trend 0.07). The leading causes of hospitalization from 2004 to 2013 were: maintenance chemotherapy/radiotherapy – 3.5% (95% CI 3.2-3.8%); pneumonia – 3.2% (95% CI 3.1-3.3%); complications of surgery, medical care, devices, and implants – 2.8% (95% CI 2.8-2.9%); fluid/electrolyte abnormalities – 2.4% (95% CI 2.4-2.5%); and heart failure/pulmonary circulation diseases – 2.2% (95% CI 2.1-2.2%). In-hospital mortality for patients with metastatic cancer declined from 10.3% (95% CI 9.9-10.7%) in 2004 to 8.1% (95% CI 7.8-8.3%) in 2013 ( P for trend < 0.01). Higher odds of in-hospital mortality were consistently seen each year with increasing age, non-Hispanic blacks, self-payment, and admissions at hospitals other than urban teaching hospitals. Conclusions: The relative hospitalization rates for adults with metastatic cancer remain stable. Significant declines in in-hospital mortality for these patients are noted but disparities are seen for certain groups. The economic burden and policy implications of these findings for end-of-life care warrant further investigation.