U E S D A Y 913 Non-Steroidal Antiinflammatory Drugs (NSAIDs)-Induced Acute Urticaria: A Genome-Wide Association Study In The Spanish Population Dr. Jose A. Cornejo-Garcia, PhD, Dr. Mike Lee, Dr. Natalia BlancaL opez, MD, PhD, Dr. Lieh-Bang Liou, Dr. Chien-Hsiun Chen, Dr. Inmaculada Do~na, MD, PhD, Veronique Godineau, Dr. Jose Julio Laguna, Dr. F. Javier Fernandez, MD, PhD, Dr. Pedro Ayuso Parejo, PhD, Mrs. Maria del Carmen Plaza-Ser on, Bsc, Dr. Gabriela Canto, MD, PhD, Dr. Miguel Blanca, MD, PhD; Research Laboratory, Carlos Haya Hospital, Malaga, Spain, Laboratory for International Alliance on Genomic Research, RIKEN Center for Integrative Medical Sciences, Yokohama Kanagawa, Japan, Allergy Service, Infanta Leonor Hospital, Madrid, Spain, Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Lin-kou, Kwei-san, Tao-yuan, Taiwan, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan, Allergy Service, Carlos Haya Hospital, M alaga, Spain, Hospital De La Cruz Roja, Madrid, Spain, UMH Alicante G.University Hospital Allergy Sect., Alicante, Spain. RATIONALE: The most important group of medicaments responsible for hypersensitivity drug reactions (HDRs) is NSAIDs, with acute urticaria/ angioedema (AUA) induced by cross-intolerance themost frequent clinical entity. Most of the genetic studies carried out have focused in the study of single nucleotide polymorphisms in genes related with prostaglandins and leukotrienes synthesis. In order to identify new genetic variants potentially involved in NSAIDs-induced AUA we conducted a GWAS in a Spanish population. METHODS: Patients and controls were recruited in clinical centers integrated in the Spanish Network for Allergic Diseases. All patients experienced more than 2 episodes with at least 2 different unrelated NSAIDs, and those with airways or chronic urticaria were excluded. Whole-genome scan was conducted using Axiom Genome-Wide CEU Array chip on 308 NSAIDs-induced AUA patients and 144 NSAIDs tolerant age, sex-matched controls. RESULTS: Although no SNPs reached genomewide p-value after Bonferroni correction, our results revealed 32 SNPs with suggestive significant associations (10<p<10) with NSAIDs-induced AUA. The lowest p values corresponded to polymorphisms located on chromosome 17; rs7225428 in GOSR2 (p51.11x10), rs197111 (p57.68x10), and rs1071682 in EFTUD2 (p51.77x10). CONCLUSIONS: The identification of new variants potentially associated with NSAIDs-induced AUA opens up new clues for understanding the mechanisms underlying this disease, the most important clinical entity induced by HRs.