Figure 2 demonstrates two distinct mIDH1 clones at baseline, one harboring NPM1/NRAS co-mutations and the other harboring NPM1/FLT3-TKD co-mutations. Following IVO treatment, the IDH1/NPM1/NRAS clone was no longer detected…. Reduction in the IDH1/NPM1/FLT3-TKD clone was observed at Cycle 2 Day 1, but it ultimately expanded at relapse with the acquisition of mIDH2. In both cases, plasma 2-HG was first inhibited by >95% but increased at relapse.