The purpose of this study is to determine the efficacy and the safety profile and toxicity of a combination of Velcade™ (bortezomib) with a standard chemotherapy regimen (ACVBP [doxorubicin, cyclophosphamide, vindesine, bleomycin, and prednisone]) in the treatment of previously untreated patients with peripheral T-cell lymphoma (PTCL).