Figure 2 . Frequency of pharmacogenomics HLA allele, drug, and adverse drug reactions in patients with pre-stored HLA data. The left side process represents patients with HLA alleles associated with ADRs (seven alleles); the middle process represents patients who were prescribed medications (seven drugs) with known HLA-associated ADRs; and the right side process represents HLA-related ADRs from the Drug Safety Center reports and review of the diagnoses. HLA, Human Leukocyte Antigen; PGx, Pharmacogenomics; ADRs, Adverse Drug Reactions; SNUH, Seoul National University Hospital; SJS, Steven Johnson Syndrome; DE, Drug reaction with eosinophilia and systemic symptoms