Still other genetic diseases that can be associated with EBV-associated HLH, or chronic active EBV or lymphoproliferative diseases, include ITK deficiency, CD27 deficiency, CD70 deficiency, and magnesium transporter 1 (MAGT1) deficiency which is called X-linked immunodeficiency with magnesium defect, EBV infection, and neoplasia or XMEN disease (36–45). The gene discussed is CD27; the disease is hyperinsulinemic hypoglycemia, familial, 4.