title: [Thyroid pathology and lymphoproliferative diseases].
abstract: Four cases are reported, of an association between a thyroidal illness (1 hypothyroidism, 3 hyperthyroidism) on one hand, and a lymphocytic proliferation and/or monoclonal gammapathy on the other. The following findings: HLA B8 or DrW3 in 3, antithyroid antibodies at a very high level in 2, and thyroid stimulating immunoglobulin in 2 support the conclusion of thyroidal diseases of auto-immune nature. Simultaneous appearance of both thyroidal and hematologic illness favors the hypothesis of a non coincidental association. A direct thyroidal activity of the monoclonal paraprotein has been found only once among the 4 published and our 2 cases in which it has been studied. A more likely link would be a common physiopathology: a functional deficiency of T suppressor lymphocytes allowing the proliferation of a cellular clone producing an abnormal immunoglobulin, would also allow the development of a thyroidal illness when favored by a genetic predisposition.
mesh_terms: D000368:Aged; D005260:Female; D006680:HLA Antigens / Q000032:analysis; D015795:HLA-B8 Antigen; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D018828:Immunoglobulins, Thyroid-Stimulating; D008232:Lymphoproliferative Disorders / Q000150:complications* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D013959:Thyroid Diseases / Q000150:complications* / Q000276:immunology
chemical_list: D006680:HLA Antigens; D015795:HLA-B8 Antigen; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007074:Immunoglobulin G; D018828:Immunoglobulins, Thyroid-Stimulating
vernacular_title: Pathologie thyroïdienne et maladies lymphoprolifératives.