Multiple Myleoma

The primary purpose of the study is to evaluate whether biweekly administered XEMBIFY® plus Standard Medical Treatment (SMT) over a one-year period will reduce the rate of major bacterial infections per participant per year in B-cell CLL, MM, and NHL participants with hypogammaglobulinemia (HGG) in comparison to the Placebo plus SMT group.

All subjects will receive GR1803 injection until intolerable toxicity or investigator-assessed disease progression occurs (except in cases of disease progression due to discontinuation of the drug as a result of an adverse event) or until the subject has been administered the drug for 2 years or until the subject withdraws consent or until the investigator determines that the subject needs to be discontinued.

The goal of this clinical trial is to evaluate the efficacy of Teclistamab (Te) and autologous lymphocyte infusions (ALI) in relapse refractory multiple myeloma. The main question it aims to answer is: which is the Duration of response (DoR) with Teclistmab and ALI? Participants will receive Te for 5 cycles. Participants in PR or better after the first five cycles of Te monotherapy will continue treatment with Te in combination with ALI administration starting from cycle 6