Medical Care Costs Associated With Cancer in Integrated Delivery Systems

Authors:
Matthew P. Banegas Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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K. Robin Yabroff Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Maureen C. O'Keeffe-Rosetti Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Debra P. Ritzwoller Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Paul A. Fishman Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Ramzi G. Salloum Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Jennifer Elston Lafata Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Mark C. Hornbrook Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon; Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado; Department of Health Services, University of Washington, Seattle, Washington; Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, Florida; and School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina.

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Background: The high economic burden of cancer is projected to continue growing. Cost-of-care estimates are key inputs for comparative effectiveness and economic analyses that aim to inform policies associated with cancer care. Existing estimates are based largely on SEER-Medicare data in the elderly, leaving a knowledge gap regarding costs for patients aged <65 years. Methods: We estimated total and net medical care costs using data on individuals diagnosed with breast, colorectal, lung, or prostate cancer (n=45,522) and noncancer controls (n=314,887) enrolled in 1 of 4 participating health plans. Net costs were defined as the difference in mean total costs between patients with cancer and controls. The phase-of-care approach and Kaplan-Meier Sample Average method were used to estimate mean total and net 1- and 5-year costs (in 2015 US dollars) by cancer site, stage at diagnosis, and age group (<65 and ≥65 years). Results: Total and net costs were consistently highest for lung cancer and lowest for prostate cancer. Net costs were higher across all cancer sites for patients aged <65 years than those aged ≥65 years. Medical care costs for all cancers increased with advanced stage at diagnosis. Conclusions: This study improves understanding of medical care costs for the 4 most common invasive cancers in the United States. Higher costs among patients aged <65 years highlight limitations of relying on SEER-Medicare data alone to understand the national burden of cancer, whereas higher costs for patients with advanced-stage cancer underscore the importance of early detection to curtail high long-term costs. These cost estimates can be used in the development and evaluation of interventions and policies across the cancer care continuum.

Author contributions: Study concept and design: Banegas, Yabroff, Hornbrook. Data analysis: Banegas, O'Keeffe-Rosetti. Interpretation of results: All authors. Manuscript preparation: All authors.

Correspondence: Matthew P. Banegas, PhD, Center for Health Research, Kaiser Permanente Northwest, 3800 North Interstate Ave, Portland, OR 97227-1110. Email: Matthew.P.Banegas@kpchr.org

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