Can a simple injection replace an IV for this myeloma drug?

This trial is testing whether belantamab, a drug used for multiple myeloma, can be given as a quick injection under the skin instead of a slow drip into a vein. About 22 adults with multiple myeloma who are already on standard maintenance therapy will receive both forms in a crossover design, allowing direct comparison. The study measures how much of the drug reaches the blood, how long it stays there, and whether the injection is safe and well tolerated. If successful, this could make treatment more convenient without compromising effectiveness.