Health-Related Quality of Life in Patients With Relapsed/Refractory Multiple Myeloma Treated With Carfilzomib, Dexamethasone, and Daratumumab Versus Carfilzomib and Dexamethasone: An Analysis of Patient-Reported Outcomes From the Phase 3 CANDOR Trial

BACKGROUND: In the phase 3 CANDOR trial (NCT03158688), daratumumab added to carfilzomib and dexamethasone (KdD) significantly prolonged progression-free survival relative to carfilzomib and dexamethasone (Kd) alone in previously treated patients with relapsed/refractory multiple myeloma (RRMM). MATERIALS AND METHODS: We present a post hoc analysis of the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30-item module (EORTC QLQ-C30) and EORTC QLQ Myeloma 20-item module (EORTC QLQ-MY20) patient-reported outcome (PRO) measures from the CANDOR trial. RESULTS: Median (range) duration of observation for PROs was 18.4 (0.9-50.0) months (KdD) and 10.3 (0.9-48.4) months (Kd). PRO compliance rates were high and similar between arms. Mean scores on the EORTC QLQ-C30 global health status (GHS)/quality-of-life (QOL) scale were numerically higher in the KdD than in the Kd arm and were generally sustained or trended toward improvement from baseline. Other EORTC QLQ-C30, EORTC QLQ-MY20, and EQ-5D visual analog scale (VAS) scores were generally similar between treatment arms and were stable over time, with some numerical trends favoring KdD. Risks of deterioration were similar for most scales; hazard ratios suggested improvement for KdD for EORTC QLQ-C30 social functioning, EORTC QLQ-MY20 disease symptoms, and EQ-5D VAS. Results were consistent for lenalidomide-exposed and lenalidomide-refractory subgroups. EORTC QLQ-C30 GHS/QOL scores trended toward improvement at some time points, and other scores remained generally stable when daratumumab was added to carfilzomib and dexamethasone. CONCLUSION: These results support the benefits of KdD for the RRMM population, including lenalidomide-exposed and lenalidomide-refractory patients. CLINICAL TRIAL REGISTRATION: NCT03158688.