Wadmalaw Island

This research aims to evaluate whether administering XEMBIFY every two weeks alongside Standard Medical Treatment SMT over a one-year period can reduce the number of major bacterial infections each year in adults with low antibody levels hypogammaglobulinemia who have B-cell Chronic Lymphocytic Leukemia CLL, Multiple Myeloma MM, or Non-Hodgkin Lymphoma NHL. The study compares this treatment to a placebo plus SMT to determine its impact on infection rates. Participants are randomly assigned to one of two groups. One group receives a loading dose of XEMBIFY subcutaneously at 150 mgkgday for five consecutive days starting in Week 1, followed by biweekly doses of 300 mgkg until Week 51. The other group receives a placebo injection on the same schedule. Both groups continue to receive the standard medical treatments and supportive care they require throughout the study. During the study, participants will have regular assessments including monitoring the frequency of infections, hospitalizations, and antibiotic use. Researchers will measure the annual rate of major bacterial infections and track the time to first infection among other outcomes up to Week 51. Participants are observed closely throughout the treatment year to evaluate safety and effectiveness, with the entire study lasting approximately one year per participant.