Avelumab In Combination Regimens That Include An Immune Agonist, Epigenetic Modulator, CD20 Antagonist and/or Conventional Chemotherapy in Patients With Relapsed or Refractory Diffuse Large B-cell Lymphoma (R/R DLBCL)

The target study population of this Phase 1b/3 registrational study is patients with R/R
DLBCL who have completed at least 2 (but not more than 4) lines of prior rituximab-containing
multi-agent chemotherapy, and/or in whom autologous stem cell transplant (ASCT) has failed,
or who are not candidates for ASCT or who are not eligible for intensive chemotherapy.
Patients who are ineligible for intensive second line chemotherapy must have received at
least one prior rituximab-containing combination chemotherapy regimen. The study will assess
the safety, efficacy, pharmacokinetics (PK), immunogenicity of the 3 avelumab-based
combination regimens tested, and collect patient reported outcome (PRO) data.

Key Inclusion Criteria:

-Any of the following as defined by the WHO, 2016 lymphoid neoplasm classifications and
histologically confirmed:

- Diffuse large B-cell lymphoma (DLBCL), Not Otherwise Specified (NOS): Germinal center
B-cell type (GCB), Activated B-cell type (ABC)

- High-grade B-cell lymphoma (HGBCL) NOS

- HGBCL with MYC and BCL2 and/or BCL6 rearrangements

- T-cell histocyte-rich large B-cell lymphoma

- EBV+ DLBCL, NOS

- HHV8+ DLBCL, NOS

Relapsed or refractory disease following at least 2 lines (and a maximum of 4 lines) of
prior rituximab containing multi-agent chemotherapy which may include an autologous stem
cell transplantation unless patients are not considered suitable for intensive second-line
chemotherapy or autologous stem cell transplantation. Patients who are ineligible for
intensive second line chemotherapy,must have received at least one prior
rituximab-containing combination chemotherapy regimen. Patients who are ineligible for
intensive second line chemotherapy, must have received at least one prior
rituximab-containing combination chemotherapy regimen.

- Baseline measurable disease with at least 1 bi dimensional lesion with longest
diameter (LDi) >1.5cm on CT scan which is FDG avid on PET scan.

- A biopsy (archived or Screening/recent) will be collected at Screening.

- At least 18years of age (or ≥20 years in Japan).

- Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) 0 or 1.

Key Exclusion Criteria:

- Active central nervous system (CNS) lymphoma.

- Prior organ transplantation including prior allogeneic SCT.

- Prior therapy with an anti PD 1, anti PD L1, anti PD L2, anti CD137, or anti cytotoxic
T lymphocyte associated antigen 4 (CTLA 4) antibody (including ipilimumab,
tremelimumab or any other antibody, or drug specifically targeting T cell co
stimulatory or immune checkpoint pathways).