Overview All-trans Retinoic Acid in Combination With a KPD Regimen for the Treatment of Refractory/Relapsed Multiple Myeloma Status: Recruiting Trial end date: 2025-12-31 Target enrollment: Participant gender: Summary To investigate the safety and efficacy of the ATRA combined with the KPD regimen in patients with refractory relapsed multiple myeloma. Phase: Phase 2 Details Lead Sponsor: The First Affiliated Hospital of Xiamen UniversityTreatments: Tretinoin