CTLA4 and myasthenia gravis: A large genome-wide association study involving patients from North America and Italy identified different haplotypes across the HLA region, cytotoxic T-lymphocyte-associated protein 4 gene (CTLA4) and tumor necrosis factor receptor 4 superfamily, member 11a, (TNFRSF11A) and NFκB activator genes in early- and late-onset MG cases [56].