This clinical trial is focused on studying a condition known as relapsed/refractory multiple myeloma, which is a type of blood cancer that affects plasma cells in the bone marrow. The study is testing a combination of medications to see how well they work together. The medications being used in this study are Iberdomide (also known by its code name CC-220), Cyclophosphamide, and Dexamethasone. Iberdomide is a capsule that has activities that can help regulate the immune system and promote the death of cancer cells. Cyclophosphamide is a tablet that works as an alkylating agent, which means it can interfere with the growth of cancer cells. Dexamethasone is a tablet that is a type of steroid used to reduce inflammation and suppress the immune system.
The purpose of this study is to evaluate how long patients can live without their disease getting worse while taking this combination of medications. Participants in the study will take these medications by mouth in specific doses over a period of time. The study will monitor the participants’ health and response to the treatment, including any side effects they may experience. The study will also look at how well the treatment works in terms of overall response and survival rates.
Throughout the study, participants will be closely observed to ensure their safety and to gather information on how the treatment affects their condition. The study aims to provide valuable insights into the effectiveness of this treatment combination for patients with relapsed/refractory multiple myeloma. The results could help improve future treatment options for this challenging condition.



The Netherlands