Clinical Study of Reduced-dose Pomalidomide and Cyclophosphamide Combined With Dexamethasone in the Treatment of Patients With Debilitating RRMM

The starting dose of pomalidomide was 2 mg in all cases，the starting dose of cyclophosphamide was 50 mg/day.If the adverse event is attributable to a specific study drug, the dose is reduced accordingly for that drug; if the adverse event is associated with multiple drugs, the dose is reduced appropriately for one of the predominantly associated drugs at the discretion of the investigator; and if multiple adverse events occur concurrently, the dose should be adjusted according to the guidelines for the most severe toxicity.