ODC1 and monoclonal gammopathy: Furthermore, analyses of two gene expression omnibus (GEO) databases, GSE5900 (p<0.0001; Figure 7G) and GSE6477 (p=0.0350; Figure 7H), demonstrated that ODC1 mRNA was significantly increased in MM patients compared with smoldering myeloma (SMM), monoclonal gammopathy of undetermined significance (MGUS), and normal plasma (NP).