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:

   - Classic Hodgkin Lymphoma (cHL), relapsed or refractory

   - 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.

   - One prior anti-cancer therapy that did not work

Exclusion Criteria:

   - Active, known, or suspected autoimmune disease or infection

   - Active cerebral/meningeal disease related to the underlying malignancy

   - More than one line of anti-cancer therapy or no treatment at all

   - Received a stem cell transplant for Hodgkin Lymphoma and/or a solid organ transplant

   - Prior treatment with any drug that targets T cell co-stimulation pathways (such as
   checkpoint inhibitors)

Other protocol defined inclusion/exclusion criteria apply