["waldenström's macroglobulinemia"]
['ibrutinib', 'placebo', 'rituximab']

        Eligibility Criteria for the Randomized Study

        Inclusion Criteria:

          -  Untreated or previously treated for WM. Previously treated subjects must have either
             documented disease progression or had no response (stable disease) to the most recent
             treatment regimen

          -  Centrally confirmed clinicopathological diagnosis of WM

          -  Measurable disease defined as serum monoclonal immunoglobulin M (IgM) >0.5 g/dL

          -  Symptomatic disease meeting at least 1 of the recommendations from the Second
             International Workshop on Waldenström Macroglobulinemia for requiring treatment

          -  Hematology and biochemical values within protocol-defined limits

          -  Men and women ≥ 18 years of age

          -  Eastern Cooperative Oncology Group (ECOG) performance status of ≤ 2

        Exclusion Criteria:

          -  Known involvement of the central nervous system by WM

          -  Disease that is refractory to the last prior rituximab-containing therapy defined as
             either

               -  Relapse after the last rituximab-containing therapy < 12 months since last dose
                  of rituximab, OR

               -  Failure to achieve at least a minor response (MR) after the last
                  rituximab-containing therapy If the subject meets this exclusion criterion and
                  therefore is excluded from the main randomized study, participation in the non
                  randomized substudy (Arm C) may be considered

          -  Rituximab treatment within the last 12 months before the first dose of study drug

          -  Known anaphylaxis or (immunoglobulin E) IgE-mediated hypersensitivity to murine
             proteins or to any component of rituximab

          -  Prior exposure to ibrutinib or other Bruton's tyrosine kinase (BTK) inhibitors

          -  Known bleeding disorders (eg, von Willebrand's disease) or hemophilia

          -  History of stroke or intracranial hemorrhage within 12 months prior to enrollment.

          -  Any uncontrolled active systemic infection.

          -  Any life-threatening illness, medical condition, or organ system dysfunction that, in
             the investigator's opinion, could compromise the subject's safety or put the study
             outcomes at undue risk.

          -  Currently active, clinically significant cardiovascular disease

          -  Requires treatment with a strong cytochrome P450 (CYP) 3A inhibitor

        Eligibility Criteria for Open-label Substudy Treatment Arm C

        The inclusion/exclusion criteria for the substudy (Arm C) are identical to those described
        above for the randomized study but, to be eligible, subjects need to be considered
        refractory to the last prior rituximab-containing therapy defined as either

          -  Relapse after the last rituximab-containing therapy <12 months since last dose of
             rituximab, OR

          -  Failure to achieve at least a MR after the last rituximab-containing therapy.
      