The study “Prevalence of JAK2 Mutations in Patients with Abdominal Venous Thrombosis” (JAK2 MV Study) prospectively investigated patients with abdominal venous thromboses in the federal state of Mecklenburg-West Pomerania (MV) in north-east Germany (see Supplementary Figure 1) for the presence of mutations in the gene of Janus kinase 2 (JAK2). The gene discussed is JAK2; the disease is thrombotic disease.