To Evaluate the Efficacy and Safety of QL2109 and DARZALEX FASPRO® in Multiple Myeloma

QL2109 will be given 1800 mg subcutaneously at weekly intervals (QW) for 8 weeks, then every 2 weeks (Q2W) for an additional 16 weeks, then every 4 weeks (Q4W) thereafter. Subjects will receive pre-infusion medications before infusions to mitigate potential IRRs.

Intervention Description：Pomalidomide will be administered at full dose of 4 mg orally (PO) on Days 1 through 21 of each 28-day cycle

Dexamethasone will be administered at a dose of 40 mg (20 mg for patients ≥75 years of age) orally, once daily on Days 1, 8, 15, and 22 of each 28-day treatment cycle

DARZALEX FASPRO® will be given 1800 mg subcutaneously at weekly intervals (QW) for 8 weeks, then every 2 weeks (Q2W) for an additional 16 weeks, then every 4 weeks (Q4W) thereafter. Subjects will receive pre-infusion medications before infusions to mitigate potential IRRs