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Agammaglobulinemia and Hypogammaglobulinemia-Relationship to the Mesenchymal Diseases* ROBERT A. GOOD AND (Presented ANN E. GABRIELSENt by Dr. Good) From the Pediatr~c Re.search L.aboratories of the Varieu) Club Heart Hospital, Unioereiuj of j]i[mnesota, Minneapolis, Minnesota In beginning this discussion of the relationship of agammao'lobulinemiahypogammaglo?ulinemia to the mesenchymal or "collagen" ~1"OUpof disea 'es, I would like to set the minds of some of the investigators at ease. We hav~ not observed, nor do we know of others who have observed, patients having any of .the extreme immunologic deficiency diseases together with acute .r~e~matlC fever. However, Gitlin (22) has seen a form of glomerulonephritis 111two patients with agammaglobulinemia which he will mention 111the Discuss.ion. Thus, it seems that at least one form of presumed post~treptococcal disease can occur in patients with extreme immunologic deficiency. Interes~ in the ,simultaneous occurrence of mesenchymal disease and se".ere deficiency of ,gamma globulin developed soon after Bruton's (9) clas~lCal d.escnptIOl1 of agammaglobulinemia. In the early reports, a number of 111Ve~tlgators documented the observation that joint swelling, redness and effusion had occUlT~d in agammaglobulinemic patients under study (11, 36, 44). In several mstances, although septic arthritis was suspected, no * ?riginal studies discussed were supported by grants from the U. S. Public Health Serv:,ce, the N ational Foundation, the Minnesota Chapter of the Arthritis and Rheurnatism Foundation and the American and 'linnesota Heart Associations. . t Department o.f Pediatrics, Training Grant HTS-5462, 1 ational Institutes of Health, U. S. PublIc Health Service. 368 Hlld I~KILlnll1ltKI()I)UIIlI .nua came rrom 'JlI.l: 1)():i~()11 1:'>""'1 1\;" ".r ''''''''''''',1 Hlld :il,lill (.12). Tiley presented these ca 'cs Ull IeI' tile heading or "(,CIIOHYII()viLiH";however, ill several instance the case histories were most sugW'HLiv(lor rheumatoid arthritis. A short time later, we (32) presented Our (lXP )l'iCI1CCwith cvoral agammaglobulinemic patients who had perfectly Lypical manifestations of rheumatoid arthritis. It was our contention at (,Iml, Lime, strongly reinforced by subsequent experience, that a disease illdiHLillgui,'ilable clinically from rheumatoid arthritis occurs with inordiuuto frequency among: both children and adults with agammaglobulincmia. l3al'andUIl et al. (3), too, have observed a striking frequency of join] lisca c among patients with "Aiuikorpermomqeleundrom," but, beGIWHO of the mild nature of the disease observed, have chosen to refer to it ItH toxic arthritis rather than as true rheumatoid arthritis. Before pre enting case material supporting our contention that several mOHCIl.hyrnal diseases are intimately related to the immunologic defieicil 'y di orders, it seems appropriate to present a classification of the Iorrns f agammaglobulinemia-hypogammaglobulinemia as we now see (,JtCI ,a' well as a description of the nature of the dysproteinemia and the immunologic defect in each instance. The nature and extent of the immunologi deficiency seem to be of central importance in a discussion of relationship: of the mesenchymal and immunologic deficiency diseases. Durinz the 10 years since Bruton first described the disease he called agammaglobulinemia, approximately 350 cases have been reported in the lit rature (reviewed in (31)), and a number of medical groups in several I arts of the world have had extensive experience with large groups of these patients, Although there are minor differences in the proposed classifications, as well as in experience and interpretation, the parallels in the findings in these large and well studied groups of patients have been striking. The classification of the members of our group of agammaglobulinemiahypogammaglobulinemia patients is set down in table 15-1. As we gain understanding of the mechanisms involved in these defects, and as our experience grows, new groups will have to be added and the designations of the old groups changed. To us, classifications are not right or wrong, but useful or not useful; and the classification here set down has been useful up to the present. The table includes the number of patients in each category studied at the University of Minnesota. The evidence that one form of congenital agammaglobulinemia is inherited as a simple Ifendelian recessive trait is substantial. Kulneff ei al. (44) first presented substantial evidence of the genetic nature of childhood