Purpose: Patients with lower-risk (LR) myelodysplastic syndromes myelodysplastic syndromes: (my-eh-lo-diss-PLASS-tik SIN-dromez) A group of disorders where the bone marrow does not work well, and the bone marrow cells fail to make enough healthy blood cells. Myelo refers to the bone marrow. Dysplastic means abnormal growth or development. People with MDS have low blood cell count for at… (MDS) who are RBC transfusion dependent and have experienced relapse after or are refractory refractory: Not responsive to treatment or cure. For example, refractory anemia is a low red blood cell count that doesn't respond to standard treatments. to erythropoiesis-stimulating agent (ESA) have limited treatment options. High telomerase activity and human telomerase reverse-transcription expression in clonal hematopoietic cells have been reported in patients with MDS. Imetelstat Imetelstat: Who should not take RYTELO? Before taking RYTELO, tell your healthcare provider about all your medical conditions, including if you: are pregnant or plan to become pregnant. RYTELO may harm your unborn baby and may cause loss of pregnancy. Tell your healthcare provider right away if you… , a first-in-class competitive inhibitor of telomerase enzymatic activity, targets cells with active telomerase. We report efficacy, safety, and biomarker data for patients with LR MDS who are RBC transfusion dependent and who were relapsed/refractory to ESAs.
Patients and methods: In this two-part phase II/III study (MDS3001), the primary end point was 8-week RBC transfusion independence transfusion independence: No longer needing any type of blood transfusion. (TI) rate, with key secondary end points of 24-week RBC TI rate, TI duration, and hematologic improvement-erythroid.
Results: Data from the phase II part of the study are reported. Of 57 patients enrolled and treated (overall population), 38 were non-del(5q) and hypomethylating agent and lenalidomide lenalidomide: Lenalidomide is a capsule that is taken by mouth. It is approved for treating low-risk, transfusion-dependent myelodysplastic syndrome (MDS) patients with an abnormality of chromosome 5q. It is currently in clinical trials to test its efficacy with a broader range of MDS patients. For some MDS… naïve (subset population). The 8- and 24-week RBC TI rates in the overall population were 37% and 23%, respectively, with a median TI duration of 65 weeks. In the subset population, 8- and 24-week RBC TI rates were 42% and 29%, respectively, with a median TI duration of 86 weeks. Eight-week TI rate was observed across all subgroups evaluated. Cytogenetic and mutational data revealed a reduction of the malignant clones, suggesting disease modification activity. The most common adverse events were cytopenias, typically reversible within 4 weeks.
Conclusion: Imetelstat treatment results in a meaningful, durable TI rate across a broad range of heavily transfused patients with LR MDS who are ineligible for or relapsed/refractory to ESAs. Biomarker analyses indicated effects on the mutant malignant clone clone: To make copies. Bone marrow stem cells clone themselves all the time. The cloned stem cells eventually become mature blood cells that leave the bone marrow and enter the bloodstream. .