If one bispecific antibody stops working, can I be prescribed a different bispecific? 

If your myeloma progresses after receiving a bispecific antibody, your doctor will discuss possible treatment options with you. Potential options could include switching to a bispecific antibody with a different target, CAR-T therapy, or enrollment in a clinical trial (among other options). Which option your doctor recommends will depend on many different factors specific to you and your myeloma history.