An Open-label Phase II Study to Investigate the Efficacy, Safety, and Pharmacokinetics of Tirabrutinib in Patients With Primary Central Nervous System Lymphoma (PCNSL)

This study will evaluate the efficacy, safety, and pharmacokinetics of tirabrutinib monotherapy in patients with relapsed or refractory PCNSL (Part A), and tirabrutinib in combination with one of two different high dose methotrexate based regimens (methotrexate/ temozolimide/rituximab or rituximab/methotrexate/procarbazine/ vincristine) as first line therapy in patients with newly diagnosed, treatment naïve PCNSL (Part B).