Real-world treatment patterns and associated progression-free survival in relapsed/refractory multiple myeloma among US community oncology practices

<b>Background</b>: Evidence supporting optimal treatment sequencing in relapsed/refractory multiple myeloma (RRMM) patients requiring multiple therapy lines is lacking. <b>Methods</b>: Using retrospective chart data, this study describes real-world RRMM treatment patterns and related progression-free survival (PFS) in US community oncology clinics. <b>Results</b>: Bortezomib ± a non-immunomodulatory drug (IMiD), lenalidomide ± a non-proteasome inhibitor (PI), bortezomib + an IMiD were the most commonly used regimens in early lines of therapy. Median PFS was similar in 1^st (11.1 months) and 2^nd line (10.5) and decreased in lines 3 through 5 (3^rd: 7.9; 4^th: 7.2, 5^th: 5.4). Longest PFS (12.5 months) in first line was with bortezomib + ImiD; longest PFS in second line was with lenalidomide ± a non-PI was (13.2 months). <b>Conclusions</b>: Re-treatment with bortezomib was common; novel agents were reserved for later therapy lines. Overall, the observed PFS associated with real-world treatment sequences were shorter than those reported in clinical trials.