In the FDG-PET group, the M protein levels in IgG or IgA subtypes (34.33 ± 20.34 vs. 32.31 ± 25.72 g/L, P = 0.778) and myeloma cell densities in the bone marrow (37.43 ± 22.15 vs. 30.17 ± 24.54%, P = 0.226) were similar between patients with diffuse high marrow uptake and those with negative uptake. This evidence concerns the gene CD79A and plasma cell myeloma.