Evidence of progressive multifocal leukoencephalopathy (PML) identified on the pretreatment magnetic resonance imaging (MRI) History of progressive multifocal leukoencephalopathy (PML) Patients with a known John Cunningham (JC) virus infection and/or progressive multifocal leukoencephalopathy (PML) are not eligible History of autoimmune disease or of confirmed progressive multifocal leukoencephalopathy History of progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML) Patients must not have known John Cunningham (JC) virus infection and/or progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML). History of progressive multifocal leukoencephalopathy (PML) Participants with known history of pancreatitis or progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML) Present or history of progressive multifocal leukoencephalopathy (PML) Participants with a history of progressive multifocal leukoencephalopathy History of progressive multifocal leukoencephalopathy History of or current diagnosis of progressive multifocal leukoencephalopathy (PML) Known human immunodeficiency virus (HIV) or hepatitis B positivity or prior progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy History of progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML) Has active cerebral/meningeal disease, active cytomegalovirus (CMV) colitis, or signs and symptoms of progressive multifocal leukoencephalopathy (PML) or any history of PML. Participants with history of confirmed progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy History of progressive multifocal leukoencephalopathy Present or history of progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy Cerebral/meningeal disease, including signs and symptoms of progressive multifocal leukoencephalopathy (PML) Participants with a history of confirmed progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML) Known active cerebral/meningeal disease, including signs or symptoms of progressive multifocal leukoencephalopathy (PML); Participants with a history of confirmed progressive multifocal leukoencephalopathy (PML) History of progressive multifocal leukoencephalopathy (PML). In subjects with AITL, evidence of meningeal or cerebral disease or a history of progressive multifocal leukoencephalopathy History of progressive multifocal leukoencephalopathy (PML) Known active cerebral/meningeal disease, including signs or symptoms of progressive multifocal leukoencephalopathy (PML) or any history of PML Known cerebral/meningeal disease, including history of progressive multifocal leukoencephalopathy Patients with history of confirmed progressive multifocal leukoencephalopathy Known John Cunningham (JC) virus infection and/or progressive multifocal leukoencephalopathy (PML)