“…Polyclonal hypergammaglobulinemia is the most common protein abnormality in AILD, occurring in 75 % of cases [33], but early or late hypogammaglobulinemia [9,19,52,73,76,85], IgA deficiency [13,86], monoclonal gammopathies [l, 17,75,76], cryoglobulinemia [6,10,13], cryofibrinogenemia [4], and cold agglutinins [4,13,33] have all been reported.…”