 Similar to lymphocyte=variant hypereosinophilia, the increased levels of blood eosinophils in Gleich's syndrome is thought to be secondary to the secretion of eosinophil-stimulating cytokines by a T cell clone(s).IgG4-related disease or Immunoglobulin G4-related disease is a condition dacryoadenitis, sialadenitis, lymphadentitis, and pancreatitis (i.e.inflammation of the lacrimal glands, salivary glands, lymph nodes, and pancreas, respectively) plus retroperitoneal fibrosis.