Cell lines were provided by the Lymphoblastoid Cell Line Core of the PAAR-Pharmacogenomics of Anticancer Agents Research Group. We would like to acknowledge Shannon Delaney and Claudia Wing for assistance in collecting cell pellets. We also thank Jonathan Pritchard, Joseph Pickrell, and Mark Ciaccio for helpful discussions regarding study design; Jack Degner, Joseph Maranville, Eric Gamazon, and Nancy Cox for helpful discussions regarding data analysis; and Barbara Stranger and Fabiola Rivas for reviewing the manuscript.