A Study of Nivolumab Plus Brentuximab Vedotin in Patients Between 5 and 30 Years Old, With Hodgkin's Lymphoma (cHL), Relapsed or Refractory From First Line Treatment

Inclusion Criteria:

1. Classic Hodgkin Lymphoma (cHL), relapsed or refractory
2. Minimal limitation on activities of daily living as measured by Karnofsky ≥ 50 for participants > 16 years of age or Lansky ≥ 50 for participants ≤ 16 years of age.
3. One prior anti-cancer therapy that did not work

Exclusion Criteria:

1. Active, known, or suspected autoimmune disease or infection
2. Active cerebral/meningeal disease related to the underlying malignancy
3. More than one line of anti-cancer therapy or no treatment at all
4. Received a stem cell transplant for Hodgkin Lymphoma and/or a solid organ transplant
5. Prior treatment with any drug that targets T cell co-stimulation pathways (such as checkpoint inhibitors)

Other protocol defined inclusion/exclusion criteria apply