Preferences among patients with triple-class exposed (TCE) relapsed/refractory multiple myeloma (RRMM) in the era of B-cell maturation antigen (BCMA)-directed T-cell–engaging therapies.

Abstract

e23309 Background: BCMA-directed T-cell–engaging therapies have been introduced into clinical practice for the treatment of TCE RRMM. While efficacious, such treatments are associated with safety considerations such as cytokine release syndrome (CRS), immune effector cell-associated neurotoxicity syndrome (ICANS), and serious infections. These treatments also vary in reported efficacy, administration processes, and hospitalization requirements. The aim of this study is to quantify patient preferences and tradeoffs regarding these attributes. Methods: A discrete choice experiment (DCE) was designed to elicit preference weights corresponding to seven attributes related to efficacy (objective response rate [ORR], overall survival [OS]), safety (all-grade CRS, all-grade ICANS, serious infections) and treatment procedures (treatment administration, hospitalization requirements). Attribute levels were based on plausible ranges of potential values. Patients in the United States (US) with a physician-confirmed diagnosis of TCE RRMM were recruited. Pre-test interviews with patients were conducted and the final survey deployed online in 2023. A random-parameters logit model was used to estimate preference weights. Conditional relative importance (CRI) was calculated to rank the relative importance of each attribute. The minimum acceptable benefit (MAB) and maximum acceptable risk (MAR) were calculated to estimate the tradeoffs between efficacy and safety attributes. Results: The sample included 200 respondents (mean [standard deviation] age: 61 [6.4] years; 43% female; 46% White; 10% African American). A total of 197 participants reported having responded to prior treatment, of whom 195 had relapsed or become refractory. In the DCE, a 24-month increase in OS was found to be the most important attribute, with a CRI of 32.0%. Next most important were avoiding a 60% risk of serious infection (CRI 17.3%), avoiding 14-day hospitalization requirements (CRI 15.0%), and a 38% increase in ORR (CRI 13.7%). A treatment that could be started immediately and administered weekly or up to every 4 weeks was preferred over a CAR T-like procedure with a waiting period. Fewer initial hospitalization days was significantly preferred over more hospitalization days. The MABs for OS when the risk of serious infection was increased from 20% to 60%, CRS from 40% to 95%, and ICANS from 3% to 20% were 24.2, 17.1, and 18.0 months, respectively. When OS was increased from 12 to 36 months, the estimated MARs for serious infections, CRS, and ICANS were > 60%, > 95%, and > 20%, respectively. Conclusions: This study highlights US patient preferences regarding treatment attributes for TCE RRMM. Treatment benefits and risks and the mutual tradeoffs considered by patients should be evaluated when developing and selecting therapeutic approaches.