Seattle Genetics Inc. and Millennium Pharmaceuticals, Inc. announced the initiation of a global phase III clinical trial evaluating ADCETRIS (brentuximab vedotin) in combination with chemotherapy for the treatment of newly diagnosed CD30-positive mature T-cell lymphoma (MTCL) patients, including patients with systemic anaplastic large cell lymphoma (sALCL) and other types of peripheral T-cell lymphomas. The trial, also known as ECHELON-2, is being conducted under a Special Protocol Assessment (SPA) agreement from the U.S. Food and Drug Administration (FDA) and also received scientific advice from the European Medicines Agency (EMA). ADCETRIS is an antibody-drug conjugate (ADC) directed to CD30.

ADCETRIS is currently not approved for use in the front-line treatment of MTCL. The ECHELON-2 study is a randomized, double-blind, placebo-controlled multi-center global phase III trial designed to investigate ADCETRIS in combination with cyclophosphamide, doxorubicin and prednisone (A+CHP) versus cyclophosphamide, doxorubicin, vincristine and prednisone (CHOP) as front-line therapy in patients with CD30-expressing MTCL. The primary endpoint is progression-free survival (PFS) per independent review facility assessment using the Revised Response Criteria for malignant lymphoma (Cheson, 2007).

Secondary endpoints include overall survival (OS), complete remission (CR) rate and safety. The trial will be conducted in North America, Europe and Asia and is expected to enroll approximately 300 patients (approximately 150 patients per treatment arm). A molecular companion diagnostic test will be used in this trial to identify eligible patients based on CD30 expression.

The companion diagnostic test is being developed under a previously announced collaboration agreement with Ventana Medical Systems, Inc. (Ventana), Millennium and Seattle Genetics.