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Excess mortality, length of stay, and costs associated with serious fungal infections among elderly cancer patients: findings from linked SEER-Medicare data.

Menzin J, Lang KM, Friedman M, Dixon D, Marton JP, Wilson J

Boston Health Economics, Waltham, MA 02451, USA. jmenzin@bhei.com

OBJECTIVE: To calculate the excess mortality, length of stay, and costs attributable to serious fungal infections in hospitalized elderly patients with selected cancers. Methods: This study involved a retrospective cohort analysis using linked data from the Surveillance, Epidemiology and End Results Program of the National Cancer Institute (SEER) and Medicare claims data. Study cohorts included patients aged 65 years and older who newly received a diagnosis of a selected cancer (acute myeloid leukemia [AML] or squamous cell carcinoma of the head and neck [SCCHN]) in a SEER registry between 1991 and 1996 and who had a subsequent diagnosis of a serious fungal infection during an inpatient hospitalization, and hospitalized controls without a fungal infection matched 1:1 by age, geographic region, receipt of recent chemotherapy, concomitant bacterial infection, timing of the index hospitalization, and cancer stage at diagnosis (for SCCHN patients only). RESULTS: Eighty AML patients and 52 SCCHN patients experienced a serious fungal infection involving hospitalization. Relative to matched controls, SCCHN patients with fungal infections had significantly higher all-cause mortality (40% vs. 14%, P = 0.002), while mortality rates did not differ between AML cohorts. Patients with fungal infections had significantly longer index hospitalizations regardless of cancer type (mean: 30 days vs. 19 days for AML patients; 20 days vs. 9 days for SCCHN patients), and correspondingly higher Medicare payments (mean +/- SD: 34,268 dollars +/- 31,811 dollars vs. 21,416 dollars +/- 22,449 dollars among AML patients, P < 0.0001; 25,942 dollars +/- 29,122 dollars vs. 10,131 dollars +/- 10,686 dollars among SCCHN patients, P < 0.0001). CONCLUSIONS: Efforts to prevent these infections and/or initiate early treatment may yield both clinical and economic benefits.

Published 4 April 2005 in Value Health, 8(2): 140-8.
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