Uncommon Gm phenotypes in sera from neuroblastoma patients.

Gm phenotypes and IgG subclass levels were determined in the sera of 68 patients with neuroblastoma. The frequency of the uncommon phenotypes Gm(a+,f+,g-,b+) and Gm(a+,f+,g+,b-) was found to be significantly higher in the neuroblastoma group than in normal blood donors (p less than 0.001). IgG subclass concentrations in the nine sera with uncommon Gm phenotypes and in the sera of neuroblastoma patients were inconspicuous.