Session: 654. Multiple Myeloma: Pharmacologic Therapies: Poster III
Hematology Disease Topics & Pathways:
Research, Drug development, Clinical Research, Health outcomes research, Chemotherapy, Treatment Considerations, Non-Biological therapies, Adverse Events, Pharmacology
Methods: We sought out patients with HRMM who were undergoing ASCT within 12 months of diagnosis from January 2013 to December 2018 after receiving triplet induction in the Center for International Blood and Marrow Transplant Research (CIBMTR) database. Overall, we identified 164 patients with HRMM that fit our subpopulation of interest of patients with CKD stage 3-5 who received lenalidomide or bortezomib maintenance therapy. HRMM was defined as patients with cytogenetic features including at least one of the following: t(4:14), t(14:16), t(14:20), deletion at 17p, and abnormality at 1q, Hazard ratios (HR) were calculated comparing patients’ non-relapse mortality (NRM), relapse, progression-free survival (PFS), and overall survival (OS) for patients with HRM who received bortezomib as maintenance therapy compared to lenalidomide.
Results: There were 126 patients in the lenalidomide group and 38 patients in the bortezomib group. Various baseline characteristics between the two groups were compared. The only characteristic in which the groups significantly differed was sex; the bortezomib group was 34.8% female, while the lenalidomide group was 42.1% female. Notably, there was no significant difference between the makeup of high-risk cytogenetic abnormalities between the two groups. Patients with bortezomib maintenance therapy demonstrated worse outcome in terms of 1-year relapse with adjusted odds ratio (OR) of 0.33 (95% CI 0.13, 0.84; p-value 0.020). However, this difference was not seen when looking at 2-year relapse. The lenalidomide group also demonstrated improvement in OS when compared to the bortezomib group. Patients with CKD Stage 3-5 who received lenalidomide maintenance therapy showed improvement in OS at both 1- and 2-year intervals with survival of 98.4% at 1-year and 91.9% at 2-year, compared to 94.7% and 78.4% at 1 and 2 years respectively in the bortezomib group. This improvement in OS with the lenalidomide group was significant with HR of 0.34 (95% CI 0.12, 0.94; p-value 0.037)
Conclusions: Lenalidomide maintenance therapy demonstrated superior outcomes when compared to the bortezomib maintenance therapy with HRMM and CKD Stage 3-5. These findings contrast with recent studies showing improved survival outcomes in patients with HRMM who received bortezomib maintenance therapy. These results corroborate the continued use of lenalidomide for maintenance therapy even in patients with baseline kidney disease. There is a need for prospective randomized clinical trials regarding post-transplant maintenance therapy for HRMM.
Disclosures: No relevant conflicts of interest to declare.
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