Overlap of human genome epidemiology (HuGE), pharmacogenomics (PGx) and genome-wide association study (GWAS) literature, from 2001 to mid-March 2009. Numbers indicate the results obtained when PubMed and HuGE Navigator publication databases were searched by the following terms: PubMed: "pharmacogenet* OR pharmacogenom*" (PGx). HuGE Navigator (total publications 40,858): "pharmacogenomics" (PGxE); "GWAS" (GWAS). Searches performed on 17 March 2009. Areas are not to scale.