Highlights This study contributes data on the pharmacogenomics of acetylsalicylic acid. Brazilian data contribute to reducing the lack of diversity in genetic studies examining unrepresented groups. The genetic variants evaluated were not associated with gastrointestinal bleeding. ABSTRACT Objective: The use of acetylsalicylic acid, even in low doses, may be associated with the onset of upper gastrointestinal bleeding as an idiosyncratic response. Considering the role of the genetic background in inter-individual responses to pharmacotherapy, we aimed to investigate the role of […]