Parexel International has completed a large and complex pharmacogenetics-based early phase study. The study was conducted in a healthy volunteer population of poor metabolizers of Cytochrome P450 2D6 (CYP2D6), an important enzyme involved in the metabolism of drugs. The study monitored the QTc interval following administration of a neurological treatment, which has been shown to have a higher drug exposure in poor metabolizers of CYP2D6. More than 10,000 potential study participants were geno...