<p>We have built a new resource for imputation of SNPs for existing and future genome-wide association studies (GWAS), known as the     Division of Cancer Epidemiology and Genetics (DCEG) Reference Set. The first build of the data set includes 728 cancer-free individuals     of European descent from three large prospectively sampled studies, 98 African-American individuals from the     Prostate, Lung, Colon, and Ovary Cancer Screening Trial (PLCO), 74 Chinese individuals from a Chinese clinical trial in Shanxi, China (SHNX),     and 349 unrelated individuals from the HapMap Project (see Molecular Data Section for details on arrays used). The final harmonized dataset     includes 2.8 million autosomal polymorphic SNPs on 1,249 subjects after rigorous quality control metrics were applied.</p>

DCEG Imputation Reference Dataset

National Program of Cancer Registries study with SNP Genotypes (imputed) data on dbGaP (1,249 participants)