The IgG Subclass Distribution in 659 Myeloma Sera

Abstract
The IgG subclass of 659 IgG myeloma proteins was determined with subclassspecific antisera in agar precipitation technique. The following distribution was found: IgGl, 80% ; IgG2,10% ; IgG3, 6.4% ; IgG4, 3.6%. In addition, the light chain distribution among myeloma proteins of the subclasses was studied. The K/L ratio of the IgGl proteins was 1.7; IgG2, 2.05; IgG3, 2.2; and IgG4, 3.0. These ratios did not differ significantly. In 9 sera with IgG double M-components, the combination IgGl-IgG4 was found to be predominant.

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