This phase 2 study prioritized enrollment of PTCL-TFH. Subjects received CHOP on day 1 of each cycle for 6 cycles. Oral azacitidine (aza)...For all patients, TET2 mutations were significantly associated with CR (p=0.007), favorable PFS (p=0.004) and OS (p=0.015), while DNMT3A mutations were associated with adverse PFS (p=0.016). Within the PTCL-TFH subgroup, TET2 mutations were associated with favorable PFS (p=0.014).