CD40LG and common variable immunodeficiency: Because of a suspicion of an inherited haematological disorder, namely, common variable immunodeficiency (CVID), we also retrospectively investigated the humoral immunological profile of the patient’s mother, who was 52 years old and also had a history of mild IgM hypogammaglobulinemia (49 mg/dL l.n. 50–300 mg/dL).