Patient characteristics, treatment patterns, and outcomes among black and white patients with multiple myeloma initiating daratumumab: A real-world chart review study

Abstract

BackgroundDaratumumab was approved for multiple myeloma (MM) in 2015. While its safety and efficacy are well documented, there is limited real-world information on its use and outcomes in patients of different races. MethodsWe conducted a retrospective chart review of adult patients with MM initiating daratumumab in any line of therapy (LOT) between November 2015 and May 2020. De-identified data were retrieved from 2 US clinical sites; patient characteristics, treatment patterns, and response rate were described for black and white patients, stratified by LOT. Overall response rate (ORR), progression-free survival (PFS), and time to next LOT (TTNT) were compared between black and white patients initiating daratumumab in second line (2L) or later, adjusting for age and number of prior lines. ResultsTwo hundred and fifty-two patient charts (89 black, 163 white) were extracted. Black patients were younger at diagnosis (61.7 vs. 67.0 years) and had a similar proportion of females (black: 44.9%, white: 46.6%). Black patients had longer time between MM diagnosis and daratumumab initiation (43.2 vs. 34.1 months) and received more prior LOTs (median 3.0 vs. 2.0). ORR for black and white patients initiating daratumumab in 1L was 100.0%, with very good partial response or better in 75.0% and 66.7%, respectively. Similar trends were observed in 2L and 3L+. There were no significant differences in ORR, PFS, or TTNT between groups. ConclusionDaratumumab had similar clinical outcomes (ORR, PFS, and TTNT) in black and white patients. Black patients initiated daratumumab later in their treatment, suggesting potential discrepancies in access to new MM treatments.