1). Clinical manifestations of essential cryoglobulinemia were surveyed in 25 cases appeared in literature including 3 cases of our own. Purpura was the symptom most frequently encountered (16 cases). Twelve cases had albuminuria. Other symptoms such as Raynaud's phenomenon, cutaneous ulceration, gangrene, cold urticaria, arthralgia were seen in 40 per cent or less.
2). Cryoglobulins might be classified into following 2 groups on the immunochemical basis: 1) single component cryoglobulins composed of exclusively one kind of monoclonal immunoglobulins (single class IgG, IgA or IgM) or light chains (kappa or lambda), 2) cryoglobulins of the mixed type constituted of more than one kind of globulins. The latter group also contains immunoglobulins without fail and an immunoglobulin (IgM, IgG or IgA) which reacts in cold with another constituent like antigen-antibody interaction is called “cryoprecipitating factor”.
3). Kappa type light chains seem to predominate over lambda type ones in monoclonal IgM cryoprecipitating factors from IgM-IgG mixed cryoglobulins. Of 25 typed cryoprecipitating macroglobulins of such origin in literature, 10 were polyclonal containing both kappa and lambda, 14 contained only kappa, and the remaining one only lambda light chains.
4). Clinical and pathological aspects of cryoglobulinemia in literature were surveyed. Physicochemical and immunological characteristics of cryoglobulins were also reviewed and discussed in relation to their possible role on pathogenesis of symptoms.
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