MAGT1 and X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia: <h4>Background</h4>X-linked immunodeficiency with magnesium defect and Epstein-Barr virus infection and neoplasia (XMEN) disease is an X-linked genetic disorder of immune system caused by loss-of-function mutation in gene encoding Magnesium transporter 1 (MAGT1).