RecruitingPhase 1Drug trialA Study of Epcoritamab and Ibrutinib in People With Central Nervous System Lymphoma (CNSL)The purpose of this study is to find out whether the combination of epcoritamab and ibrutinib is a safe treatment approach that causes few or mild side effects in people with relapsed/refractory primary central nervous system lymphoma (PCNSL) or secondary central nervous system lymphoma (SCNSL).