8p11 myeloproliferative syndrome (EMS) is a rare syndrome characterized by the presence of a molecular disruption of the fibroblast growth factor receptor 1 (FGFR1) gene at the 8p11-12 chromosome locus, resulting in the formation of a novel fusion gene and subsequent production of a chimeric protein with constitutive activation of the FGFR1 tyrosine kinase (Jackson et al. 2010). Here, FGFR1 is linked to eosinophilia-myalgia syndrome.