NCIt definition : A rare dysgammaglobulinemia characterized by low or undetectable serum levels of immunoglobulin
class E (IgE). It is an uncommon primary antibody deficiency. It is most likely an
inherited immunodeficiency. It may be caused by decreased or inefficient class-switching
from progenitor B cells without any corresponding decreases in the other isotypes.
Most affected persons appear asymptomatic but may show a predisposition to autoimmune
and respiratory diseases.;