Background: Cyclophosphamide, doxorubicin, vincristine, and prednisolone (CHOP)/CHOP-like chemotherapy is widely used in peripheral T cell lymphoma (PTCL). Here we conducted a phase 2, multicenter, randomized, controlled trial, comparing the efficacy and safety of CEOP/IVE/GDP alternating regimen with CEOP in newly diagnosed PTCL. Methods: PTCL patients, except for anaplastic large cell lymphoma-anaplastic lymphoma kinase positive, were 1:1 randomly assigned to receive CEOP/IVE/GDP (CEOP, cyclophosphamide 750 mg/m 2 , epirubicin 70 mg/m 2 , vincristine 1.4 mg/m 2 [maximum 2 mg] on day 1, and prednisone 60 mg/m 2 [maximum 100 mg] on days 1-5 every 21 days, at the first and fourth cycle; IVE, ifosfamide 2000 mg/m 2 on days 1-3, epirubicin 70 mg/m 2 on day 1, and etoposide 100 mg/m 2 on days 1-3 every 21 days, at the second and fifth cycle; and GDP, gemcitabine 1000 mg/m 2 on days 1 and 8, cisplatin 25 mg/m 2 on days 1-3, and dexamethasone 40 mg on days 1-4 every 21 days, at the third and sixth cycle) and CEOP (every 21 days for 6 cycles). Analysis of efficacy and safety was of the intent-to-treatment population. The primary endpoint was a complete response rate at the end of treatment. Meanwhile, whole exome