Compare to PTCL-NOS, AITL is characterized by high frequencies of overlapping mutations in epigenetic modifiers in neoplastic T cells, including TET2 (80%), RHOA (70%), DNMT3A (33%), IDH2 (20-40%), and CD28 genes (35–37). The gene discussed is IDH2; the disease is angioimmunoblastic T-cell lymphoma.