Echelon-2 (Nct01777152), A Randomized, Double-Blind, Phase 3 Study Of Brentuximab Vedotin Plus Cyclophosphamide Doxorubicin And Prednisone Versus Cyclophosphamide, Doxorubicin, Vincristine And Prednisone In Previously Untreated Patients With Cd30-Positive Peripheral T-Cell Lymphoma: 5-Year Results