Each treatment cycle is 28 days. You will receive brentuximab alone on Day 1 and 15 of the first cycle (lead-in cycle). After cycle 1, you will receive brentuximab combined with AVD on Day 1 and 15 for 4-6 cycles, depending on your response to therapy. Brentuximab and AVD will be given to you by intravenous infusion (IV).