EPA Home A Science Inventory A Quantitative structure – mesothelioma potency model optimization for complex mixtures of elongated particles in rat pleura: A retrospective study Cook, P., J. Swintek, T. Dawson, D. Chapman, M. Etterson, AND D. Hoff. Quantitative structure – mesothelioma potency model optimization for complex mixtures of elongated particles in rat pleura: A retrospective study.