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Background: Paradigm shifts in kidney cancer management have led to higher health care spending. Here, total and per capita health care spending and primary drivers of change in health expenditures for kidney cancer in the United States between 1996 and 2016 are estimated. Methods: Public databases developed by the Institute for Health Metrics and Evaluation for the Disease Expenditure Project were used. The prevalence of kidney cancer was estimated from the Global Burden of Disease Study. Changes in health care spending on kidney cancer were assessed by joinpoint regression and expressed as annual percent changes (APCs).

e16064 Background: Upper gastrointestinal cancers are rising in prevalence and associated with high healthcare costs. We estimated trends in the US healthcare spending in patients with esophageal and stomach cancer between 1996 and 2016. Methods: We used data on national healthcare spending developed by the Institute for Health Metrics and Evaluations Disease Expenditure Project. Corresponding prevalence of esophageal and stomach cancer was estimated from the Global Burden of Diseases Study. Prevalence-adjusted, temporal trends in the US healthcare spending in patients with upper gastrointestinal cancer, stratified by age and setting of care (ambulatory, inpatient, emergency department, pharmaceutical prescriptions, nursing care and government administration) were calculated using joinpoint regression, expressed as annual percent change (APC) with 95% confidence intervals. Results: Overall, annual US healthcare spending on esophageal cancer increased from $0.76 billion (95% CI 0.68-0.86) in 1996 to $1.06 billion (95% CI 0.88-1.29) in 2016, although after adjusting for increasing prevalence, there was a significant decrease in per capita spending of -0.4%/year (95% CI -0.7%, -0.1%). Annual US healthcare spending on stomach cancer increased from $1.23 billion (95% CI $1.14 billion - $1.34 billion) in 1996 to $1.49 billion (95% CI $1.20 billion - $2.03 billion) in 2016. Per capita spending increased by 1.8%/year (95% CI 1.4%, 2.1%) between 1996 and 2011, followed by a decrease in gastric cancer-related per capita spending after 2011 (APC -4.4%/year [95% CI -5.8%, -2.9%]). Inpatient care was the largest contributor to total cost of both cancers between 1996-2016: 61.9% for esophageal cancer and 73.1% in gastric cancer in 2016. The rising price and intensity of care (defined as the cost per encounter) was the largest driver of change from 1996-2016 for both cancers, accounting for $0.28 billion (95% CI 0.12-0.41) for esophageal cancer and $0.95 billion (95% CI 0.41-1.39) for stomach cancer. Conclusions: After adjusting for rising prevalence, US per capita healthcare spending on esophageal cancer has decreased significantly since 1996, while per capita spending on gastric cancer has remained stable. Inpatient care was the most significant contributor to costs for both cancers over the time period studied.