This is a randomized, multi-center, open-label study to compare efficacy and safety of D-CHOP with standard CHOP regimen in patients with previously untreated PTCL. Study subjects are patients with histologically proven PTCL. Patients are randomized 1:1 to receive either cyclophosphamide, doxorubicin, vincristine and prednisone (CHOP) administered in 3 week cycles for 6 cycles or decitabine plus CHOP (D-CHOP) administered in 4 week cycles for 6 cycles. In the D-CHOP arm, decitabine will be administered at a dose of 10 mg/m² IV on day 1-5 every 3 weeks. This study is divided into three phases: screening phase, treatment phase and follow-up phase. Patients will receive study drug(s) for up to 6 cycles, or until unacceptable toxicity will develop or progression or voluntary withdrawal.Adverse event of every treatment cycle will be recorded.Therapy efficacy will be evaluated after finishing 3 cycles and finishing 6 cycles therapy. Patients will be followed until disease progression, died or 2 years from the last patient randomized.
Primary objective of the study is to compare the efficacy and safety of decitabine plus CHOP (D-CHOP) versus CHOP alone in patients with previously untreated peripheral T-cell lymphoma (PTCL).