The main aim of this study is to check how safe brentuximab vedotin is in adults with untreated Hodgkin Lymphoma (HL) when given together with doxorubicin (Adriamycin), vinblastine and dacarbazine therapy ('AVD'). Another aim is to learn how well treatment of brentuximab vedotin plus AVD works.
All participants will receive brentuximab vedotin plus AVD for approximately 6 months. Participants will undergo tests like Echocardiography (ECHO) and pulmonary function testing (PFT) during the study. ECHO is a test that uses ultrasound to show how the heart muscle and valves are working; PFT is a test to check how well a participant's lungs work.
Each participant will undergo a final health status check 2 months after the last treatment with brentuximab vedotin plus AVD.