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A method to estimate the mean lifetime survival increase of statin therapy
Shu-Ching Chang1, Mansen Wang1, James G Beckerman2
1Medical Data Research Center, Providence Health & Services, Portland, OR, USA.
Aim:
To propose a method for estimating the lifetime advantage of statins.
Methods:
Kaplan-Meier survival curves from published 4S and LIPID studies with 5.8- and 6.1-year follow-up were digitized. Gompertz distributions were fit up to the end of the trials, and then extrapolated out to the end of the patients' predicted lifetimes for each study.
Results:
The method results in a 9.9 (95% CI: 8.7-11.9) and 2.8 (95% CI: 2.3-3.3) years' increases for the statin groups for 4S and LIPID studies, respectively.
Conclusion:
Previous analysis of the same data was limited by the trials' relatively short run time. As such, we propose a method for correctly estimating the true effect of statin therapy in terms of total lifetime extension.
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