Ibrutinib in Combination With Corticosteroids vs Placebo in Combination With Corticosteroids in Participants With New Onset Chronic Graft Versus Host Disease (cGVHD)

Key Inclusion Criteria:

   - New onset moderate or severe cGVHD as defined by the 2014 National Institutes of
   Health (NIH) Consensus Development Project Criteria

   - Need for systemic treatment with corticosteroids for cGVHD

   - No previous systemic treatment for cGVHD (including extracorporeal photopheresis
   [ECP])

   - Participants may be receiving other immunosuppressants for the prophylaxis or
   treatment of acute GVHD but if the subject is receiving prednisone for prophylaxis or
   treatment of acute GVHD it must be at or below 0.5 mg/kg/d

   - Age ≥12 years old

   - Karnofsky or Lansky (subjects <16 years) performance status ≥60

Key Exclusion Criteria:

   - Received any previous systemic treatment for cGVHD with the exception of
   corticosteroids administered for cGVHD within the 72 hours prior to signing the
   informed consent form.

   - Inability to begin a prednisone dose ≥0.5 mg/kg/d for the treatment of cGVHD

   - Any uncontrolled infection or active infection requiring ongoing systemic treatment

   - Progressive underlying malignant disease or any post-transplant lymphoproliferative
   disease

   - Known bleeding disorders

   - Active hepatitis C virus (HCV) or hepatitis B virus (HBV)