I am on monotherapy, meaning "one drug" therapy. I did not get Rituxin or Bustimab. Both my initial MD and second opinion suggested monotherapy with zanubrutinib. This seems to be based on many factors. You need to ask your prescribing MD what are your options and "Why" he choose that treatment. In regards to improvement. My Hgb returned back to normal from mid 7's. My fatigue resolved. I basically felt "normal" within 3 weeks. My monoclonal IgM decrease about 50% within 6 months of therapy. I asked a lot of questions and I also did research. Previous posts provide good resources. Always look for the most recent information. The data seems to change fast. Best regards.