Characteristics and Treatment Patterns of Long-surviving Patients With Multiple Myeloma: Over 13 Years of Follow-up in the Connect MM Registry.

Background: Over the last 15 years, improvements in patient management and treatments have been associated with longer survival in patients with multiple myeloma (MM). The Connect MM Registry is a long-running, US, multicenter, prospective observational cohort study of patients with newly diagnosed MM (NDMM). We assessed the demographics, clinical characteristics, and treatment patterns of long-term survivors (LTS) enrolled in this registry.

Methods: Adults with NDMM (n = 3,011) were enrolled from 250 community, academic, and government sites across the US from 2009-2016. Baseline characteristics, treatment patterns, quality of life (QoL), and overall survival (OS) were examined among LTS, defined as patients with follow-up of ≥ 8 years after enrollment.

Results: As of February 7, 2023, 518 patients were LTS and 2,493 were non-LTS. LTS were generally younger and had better performance status at enrollment compared with non-LTS. Most (65%) LTS received stem cell transplants and few (2%) experienced disease progression within 6 months of starting first line of therapy. At data cutoff, 63% of LTS were still on treatment at their most recent visit. QoL scores and QoL questionnaire completion rates were consistently higher among LTS than non-LTS. The estimated 8-year OS rate of all patients enrolled in the registry was 40%, comparable to an observed 8-year survival of 39% from the Surveillance, Epidemiology, and End Results (SEER) database.

Conclusion: This analysis provides insights on long-surviving patients with MM using real-world data and therefore presents generalizability beyond data obtained in long-term follow-up of clinical trials, underscoring the need for longitudinal follow-up through registries.