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Recent Articles in Other Pharmacy and Pharmaceutical Sciences

Cross-Validation For Nonlinear Mixed Effects Models, Emily Colby, Eric Bair COBRA

Cross-Validation For Nonlinear Mixed Effects Models, Emily Colby, Eric Bair

The University of North Carolina at Chapel Hill Department of Biostatistics Technical Report Series

Cross-validation is frequently used for model selection in a variety of applications. However, it is difficult to apply cross-validation to mixed effects models (including the nonlinear mixed effects models) due to the fact that cross-validation requires “out-of-sample” predictions of the outcome variable, which cannot be easily calculated when random effects are present.We describe two novel variants of cross-validation that can be applied to nonlinear mixed effects models. One variant, where out-of-sample predictions are based on post hoc estimates of the random effects, can be used to select the overall structural model. Another variant, where cross-validation seeks to minimize the ...


High Dose Simvastatin As A Potential Anticancer Therapy In Leukemia Patients, Tamer Ahmed University of Kentucky

High Dose Simvastatin As A Potential Anticancer Therapy In Leukemia Patients, Tamer Ahmed

Theses and Dissertations--Pharmacy

Simvastatin is a 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor that is used for the treatment of hyperlipidemia. Simvastatin has recently been studied for its potential use in cancer therapy. In-vitro studies have shown that simvastatin displays anticancer activity, but at concentrations unlikely to be achieved in patients being receiving typical antihyperlipidemic treatment doses. Thus, several clinical trials were conducted to study the tolerability of high dose statins in cancer patients. The maximum tolerated dose of simvastatin was determined to be 15 mg/kg/day, 25-fold higher than a typical dose. However, it is not known if simvastatin plasma concentrations can ...