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Monoclonal gammopathy of undetermined significance (MGUS) is a plasma cell dyscrasia in which plasma cells or other types of antibody-producing cells secrete a myeloma protein, i.e. an abnormal antibody, into the blood; this abnormal protein is usually found during standard laboratory blood or urine tests.
In hematology, plasma cell dyscrasias (also termed plasma cell disorders and plasma cell proliferative diseases) are a spectrum of progressively more severe monoclonal gammopathies in which a clone or multiple clones of pre-malignant or malignant plasma cells (sometimes in association with lymphoplasmacytoid cells or B lymphocytes) over-produce and secrete into the blood stream a myeloma ...
IgG deficiency is a form of dysgammaglobulinemia where the proportional levels of the IgG isotype are reduced relative to other immunoglobulin isotypes.. IgG deficiency is often found in children as transient hypogammaglobulinemia of infancy, which may occur with or without additional decreases in IgA or IgM.
IgG deficiency - IgG deficiency is a lack of IgG in the absence of other immunoglobulin deficiencies. IgG levels of 300–600 mg/dL show a mild to moderate reduction of IgG while levels below 200 mg/dl are classified as a severe deficiency. [6] Those with IgG deficiency often get chronic or reoccurring pyogenic respiratory tract infections. [7]
This treatment replenishes Ig subtypes that the person lacks, is given at frequent intervals for life, and is thought to help reduce bacterial infections and boost immune function. [25] Before therapy begins, plasma donations are tested for known blood-borne pathogens, then pooled and processed to obtain concentrated IgG samples.
The preferred treatment for those under the age of 65 is high-dose chemotherapy, commonly with bortezomib-based regimens, and lenalidomide–dexamethasone, [106] to be followed by a stem cell transplant. A 2016 study concluded that stem cell transplant is the preferred treatment for multiple myeloma. [107]
The four known IgG subclasses are involved in antibody-dependent cellular cytotoxicity. [2] Antibodies are a key component of the adaptive immune response , playing a central role in both in the recognition of foreign antigens and the stimulation of an immune response to them.
Early detection and treatment of hypogammaglobulinemia is known to reduce rates of morbidity and the chance of long-term pulmonary complications. Evidence shows that there is an association between achieving higher IgG levels and reduced infection frequency. [6]