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Mabasa VH, Taylor SCM, Chu CCY, Moravan V, Johnston K, Peacock S, Knowling M. Verification of imatinib cost-effectiveness in advanced gastrointestinal stromal tumor in British Columbia (VINCE-BC study). J Oncol Pharm Pract 2008; 14:105-12. [DOI: 10.1177/1078155208088695] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background. This cost-effectiveness analysis of imatinib in British Columbia Cancer Agency (BCCA) patients with advanced gastrointestinal stromal tumors (GIST) was performed to justify funding. Patients and Methods. A pragmatic, retrospective review identified BCCA patients with advanced GIST who received imatinib or historical treatment during successive, pre-specified time periods. Primary outcome was the cost-effectiveness (CE) of imatinib based on median overall survival (MOS). Secondary outcomes were cost-effectiveness based on median progression-free survival (PFS) and comparison to literature efficacy. This study took the BCCA perspective. Sensitivity analyses varying effectiveness over the 95% confidence interval (CI), cost to its extremes, discounting level at 0, 3, and 5%, and substituting life expectancy for MOS were performed. Results. Forty-six and 47 patients in the imatinib and historical groups respectively showed MOS with imatinib to be 66.7 months (95%CI 61.7— infinity) compared to 7.7 (95%CI 6.0—12.6) in the historical group. Median-PFS were 45.3 months (95%CI 24.4—infinity) and 5.6 (95%CI 3.5—8.5) respectively. Imatinib effectiveness was similar to literature reports. The annual incremental CE ratio for imatinib was $15,882 CDN per median life year gained and $23,603 CDN per median year of PFS. Conclusions. Imatinib for advanced GIST seems cost-effective in BC. Results were robust across a range of sensitivity analyses. J Oncol Pharm Practice (2008) 14: 105—112.
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Affiliation(s)
- Vincent H Mabasa
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, B.C., Canada
| | - Suzanne CM Taylor
- Provincial Pharmacy, Systemic Therapy Program, British Columbia Cancer Agency, British Columbia, Canada,
| | - Christina CY Chu
- Population and Preventative Oncology, British Columbia Cancer Agency, British Columbia, Canada
| | - Veronika Moravan
- Population and Preventative Oncology, British Columbia Cancer Agency, British Columbia, Canada
| | - Karissa Johnston
- Centre for Health Economics in Cancer, British Columbia Cancer Agency, British Columbia, Canada, Department of Health Care and Epidemiology, University of British Columbia, Canada
| | - Stuart Peacock
- Centre for Health Economics in Cancer, British Columbia Cancer Agency, British Columbia, Canada, Department of Health Care and Epidemiology, University of British Columbia, Canada
| | - Meg Knowling
- Medical Oncology, Systemic Therapy Program, British Columbia Cancer Agency, British Columbia, Canada
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